Image Attribution

Last updated: 24 October 2026

StudyDerm is operated by FINTECH SERVICES LTD ("Fintech Services Limited"), a company registered in England and Wales, company number 13338780, registered office Apollo House, Hallam Way, Whitehills Business Park, Blackpool, England, FY4 5FS, trading as StudyDerm.

This page credits the people who made the clinical images used in StudyDerm and explains where our questions come from. It is unofficial study material and is not affiliated with or endorsed by any examining body. See our Content Accuracy and Complaints page for more.

1. Our image licence policy

We only use images that carry one of these licences:

Public domain.
CC0 (Creative Commons Zero, no rights reserved).
CC BY (Creative Commons Attribution).
CC BY-SA (Creative Commons Attribution-ShareAlike).

We never use images under NonCommercial (NC) or NoDerivatives (ND) licences, because StudyDerm is a commercial service.

How this is enforced:

Each image question records its own source page, creator, licence and a SHA-256 fingerprint of the image file.
Any image whose licence is not on the list above is rejected before it can be used.
Our image review process checks that the source page shows the stated creator and licence, that the licence permits commercial reuse with attribution, and that a patient could not be identified from the picture. This is a documented check against the source page. It is not a clinical review or sign-off. See Content Accuracy and Complaints.
The credit and licence name are shown under each picture in the app, with a link to the source page.

Where an image is licensed CC BY or CC BY-SA, you can read the licence terms at the Creative Commons website using the licence name and version in the table below. Images remain the property of their creators. Our use of an image does not give you or anyone else any right in it beyond the licence the creator chose.

Images may be resized or compressed for display. Where we have cropped an image, the credit says so.

Patient privacy: images are published teaching images from public sources. We do not upload patient photographs of our own. Our image review process checks that a patient could not be identified from the picture.

2. Images in use today

Live images: 187. An image is listed here only if the question or card using it has been approved for display.

Count by licence:

Licence as recorded	Images
CC BY 2.0	5
CC BY 3.0 DE	2
CC BY 3.0	10
CC BY 4.0	72
CC BY-SA 3.0	40
CC BY-SA 4.0	36
CC0 1.0	8
Public domain	14

"Creator" and "Source page" are exactly as recorded in our data. "Subject" is derived from the image file name. "Topic unit" is the internal unit that uses the picture. Where one picture is used in more than one question, it appears once.

#	Subject	Topic unit	Creator (as recorded)	Source page	Licence (as recorded)
1	Acne comedonal forehead	acne	Dr. Thomas Brinkmeier	https://commons.wikimedia.org/wiki/File:Acne_comedonica,_Stirn,_%C2%A9WIKIDERM.jpg	CC BY 4.0
2	Acne keloidalis nuchae nape	acne	Ravi Kumar Chittoria, Devi Prasad Mohapatra, Friji Meethale Thiruvoth, Dinesh Kumar, Arjun Asokan, Vijayaraghavan Nandhagopal	https://commons.wikimedia.org/wiki/File:Acne_keloidalis_nuchae.png	CC BY-SA 3.0
3	Acne papulopustular chest	acne	Dr. Thomas Brinkmeier	https://commons.wikimedia.org/wiki/File:Acne_papulopustulosa,_Decollet%C3%A9,_%C2%A9WIKIDERM.jpg	CC BY 4.0
4	Malassezia folliculitis back	acne	Mohammad2018	https://commons.wikimedia.org/wiki/File:Pyatrisporum_folliculitis.jpg	CC BY-SA 4.0
5	Rosacea papulopustular nose cheek	acne	M. Sand, D. Sand, C. Thrandorf, V. Paech, P. Altmeyer, F. G. Bechara	https://commons.wikimedia.org/wiki/File:Rosacea_01.jpg	CC BY 2.0
6	Acute urticaria wheals chest	allergy	James Heilman, MD, via Wikimedia Commons	https://commons.wikimedia.org/wiki/File:Hives2010.JPG	CC BY-SA 3.0
7	Agep pinhead pustules thigh	allergy	Kyriakou et al., Case Rep Dermatol Med 2019	https://pmc.ncbi.nlm.nih.gov/articles/PMC6507247/	CC BY 4.0
8	Angioedema lips acute swelling	allergy	James Heilman, MD	https://commons.wikimedia.org/wiki/File:AngioedemaFra.JPG	CC BY-SA 3.0
9	Black henna tattoo ppd dermatitis arm	allergy	Panfili et al., Int J Environ Res Public Health 2017	https://pmc.ncbi.nlm.nih.gov/articles/PMC5409622/	CC BY 4.0
10	Skin prick test forearm wheals	allergy	Nikolay Komarov	https://commons.wikimedia.org/wiki/File:Prick_Test_example.jpg	CC BY-SA 4.0
11	Toxicodendron dermatitis forearm linear streaks	allergy	Quadell	https://commons.wikimedia.org/wiki/File:Poison_ivy_after_1_week.jpeg	CC BY-SA 3.0
12	Toxicodendron dermatitis leg weeping severe	allergy	Etereve	https://commons.wikimedia.org/wiki/File:Poison_ivy_with_swelling.jpg	CC BY-SA 3.0
13	Cherry angioma two papules	benign	Assafn	https://commons.wikimedia.org/wiki/File:Cherry_angioma_closeup.jpg	CC BY-SA 4.0
14	Histo dermatofibroma collagen trapping	benign	Mikael Häggström, M.D.	https://commons.wikimedia.org/wiki/File:Histopathology_of_dermatofibroma.jpg	CC0 1.0
15	Histo hidradenoma papilliferum low power	benign	Nephron	https://commons.wikimedia.org/wiki/File:Papillary_hidradenoma_-_low_mag.jpg	CC BY-SA 3.0
16	Histo pilomatricoma shadow cells	benign	Mikael Häggström, M.D.	https://commons.wikimedia.org/wiki/File:Histopathology_of_pilomatricoma,_low_magnification.jpg	CC0 1.0
17	Histo seborrhoeic keratosis horn cysts	benign	Nephron	https://commons.wikimedia.org/wiki/File:Seborrheic_keratosis_-_low_mag.jpg	CC BY-SA 3.0
18	Cd1a immunostain langerhans cells normal epidermis	bio	Ed Uthman from Houston, TX, USA	https://commons.wikimedia.org/wiki/File:Langerhans_Cells_in_Normal_Epidermis,_CD1a_Immunostain_(4435883030).jpg	CC BY 2.0
19	Dif intercellular igg	bio	Emmanuelm, via Wikimedia Commons	https://commons.wikimedia.org/wiki/File:Pemphigus_immunofluorescence.jpg	CC BY 3.0
20	Dif linear iga basement membrane	bio	Albyali S et al., Cureus 2025	https://pmc.ncbi.nlm.nih.gov/articles/PMC12790807/	CC BY 4.0
21	Histo darier corps ronds grains	bio	Patel et al., JAAD Case Reports 2025	https://pmc.ncbi.nlm.nih.gov/articles/PMC11992385/	CC BY 4.0
22	Histo epidermolytic hyperkeratosis granular layer	bio	Taghavi et al., Iranian Journal of Pathology 2022	https://pmc.ncbi.nlm.nih.gov/articles/PMC9013870/	CC BY 3.0
23	Histo pacinian corpuscle	bio	Mikael Häggström, M.D.	https://commons.wikimedia.org/wiki/File:Histology_of_a_Pacinian_corpuscle.jpg	CC0 1.0
24	Toluidine blue mast cells dermis	bio	Kulkarni et al., Cureus 2025	https://pmc.ncbi.nlm.nih.gov/articles/PMC12423731/	CC BY 4.0
25	Tzanck smear acantholytic cells	bio	Carcarrot, Wikimedia Commons	https://commons.wikimedia.org/wiki/File:Acantholytic_cells_on_a_smear_taken_from_a_patient_with_pemphigus_foliaceus.jpg	CC BY-SA 4.0
26	Keloid presternal chest claw extensions	cosm	Htirgan	https://commons.wikimedia.org/wiki/File:Keloid-Hyperinflammatory_,_Chest_Wall_Keloid,_Butterfly_Keloid.JPG	CC BY-SA 3.0
27	Solar lentigines dorsal hand	cosm	Alain Gérard	https://commons.wikimedia.org/wiki/File:Lentigo_sénile.jpg	CC BY-SA 4.0
28	Striae rubrae adolescent back	cosm	James Heilman, MD	https://commons.wikimedia.org/wiki/File:StretchMark.jpg	CC BY-SA 4.0
29	Tattoo red ink papulonodular reaction knee	cosm	Vieira et al., Asia Pacific Allergy 2024	https://pmc.ncbi.nlm.nih.gov/articles/PMC11608633/	CC BY 4.0
30	Dermatomyositis gottron papules periungual erythema	ctd	Adhikari et al., Clinical Case Reports 2023	https://pmc.ncbi.nlm.nih.gov/articles/PMC10660285/	CC BY 4.0
31	Discoid lupus scalp scarring alopecia patch	ctd	Mohammad2018	https://commons.wikimedia.org/wiki/File:Discoid_lupus_etythermayouses_new_image.jpg	CC BY-SA 4.0
32	Morphoea en coup de sabre forehead	ctd	Corbally et al., BJR Case Reports 2016	https://pmc.ncbi.nlm.nih.gov/articles/PMC6243297/	CC BY 4.0
33	Raynaud pallor phase fingers	ctd	Gazal et al., Skin Health and Disease 2026	https://pmc.ncbi.nlm.nih.gov/articles/PMC13036728/	CC BY 4.0
34	Scle annular polycyclic upper back	ctd	Porter et al., Rheumatology Advances in Practice 2025	https://pmc.ncbi.nlm.nih.gov/articles/PMC12069228/	CC BY 4.0
35	Cherry angioma red lacunae dermoscopy	dermo	Philipp Tschandl, via Wikimedia Commons	https://commons.wikimedia.org/wiki/File:Dermatoscopy_Angioma.jpg	CC BY-SA 4.0
36	Dermatofibroma central white patch dermoscopy	dermo	Alzaidieen et al., Cureus 2025	https://pmc.ncbi.nlm.nih.gov/articles/PMC12034090/	CC BY 4.0
37	Melanoma in situ atypical network dermoscopy	dermo	Braga JCT, Macedo MP, Pinto C, Duprat J, Begnami MD, Pellacani G, Rezze GG (PLoS ONE 2013), via Wikimedia Commons	https://commons.wikimedia.org/wiki/File:Superficial_spreading_melanoma_in_situ_on_dermoscopy.jpg	CC BY 4.0
38	Molluscum contagiosum crown vessels dermoscopy	dermo	Bakos et al., An Bras Dermatol 2021	https://pmc.ncbi.nlm.nih.gov/articles/PMC8790190/	CC BY 4.0
39	Pigmented bcc leaf like areas dermoscopy	dermo	Dr. Thomas Brinkmeier (WIKIDERM), via Wikimedia Commons	https://commons.wikimedia.org/wiki/File:Dermatoskopie_eines_pigmentierten_Basalzellkarzinoms.jpg	CC BY 4.0
40	Plantar wart thrombosed capillaries dermoscopy	dermo	Bristow et al., Int J Environ Res Public Health 2022	https://pmc.ncbi.nlm.nih.gov/articles/PMC9779159/	CC BY 4.0
41	Pthirus pubis crab louse dermoscopy	dermo	Fouda et al., JAAD Case Rep 2021	https://pmc.ncbi.nlm.nih.gov/articles/PMC8263518/	CC BY 4.0
42	Tungiasis crater eggs dermoscopy	dermo	Fotas et al., Trop Med Infect Dis 2026	https://pmc.ncbi.nlm.nih.gov/articles/PMC13307923/	CC BY 4.0
43	Agep flank pinpoint pustules	drugs	Mima et al., Cureus 2025	https://pmc.ncbi.nlm.nih.gov/articles/PMC12098738/	CC BY 4.0
44	Amoxicillin morbilliform exanthem trunk	drugs	Viegas et al., Cureus 2025	https://pmc.ncbi.nlm.nih.gov/articles/PMC12818909/	CC BY 4.0
45	Ciclosporin hypertrichosis child back	drugs	Souza et al., Anais Brasileiros de Dermatologia 2020	https://pmc.ncbi.nlm.nih.gov/articles/PMC7253885/	CC BY 4.0
46	Epidermal detachment back	drugs	Jay2Base, via Wikimedia Commons	https://commons.wikimedia.org/wiki/File:TENS_patient_on_day_10.jpg	CC BY-SA 4.0
47	Fixed drug eruption pigmented ovals flank	drugs	Mima et al., Diagnostics 2024	https://pmc.ncbi.nlm.nih.gov/articles/PMC11720081/	CC BY 4.0
48	Minocycline blue grey pigmentation shins	drugs	Bokuda et al., BMC Neurology 2012	https://pmc.ncbi.nlm.nih.gov/articles/PMC3522006/	CC BY 2.0
49	Sjs ten haemorrhagic crusted lips	drugs	Shimizu Saito et al., Cureus 2026	https://pmc.ncbi.nlm.nih.gov/articles/PMC13231831/	CC BY 4.0
50	Erythrodermic psoriasis trunk silvery scale	gen1	Vaidya et al., Cureus 2024	https://pmc.ncbi.nlm.nih.gov/articles/PMC11698379/	CC BY 4.0
51	Guttate psoriasis back	gen1	Bobjgalindo, cropped	https://commons.wikimedia.org/wiki/File:Guttate_psoriasis.jpg	CC BY-SA 4.0
52	Histo pustular psoriasis kogoj pustule	gen1	Lee S et al., Anais Brasileiros de Dermatologia 2026	https://pmc.ncbi.nlm.nih.gov/articles/PMC13279149/	CC BY 4.0
53	Psoriasis koebner linear plaque lower back	gen1	Srivastava et al., Oxford Medical Case Reports 2021	https://pmc.ncbi.nlm.nih.gov/articles/PMC8366067/	CC BY 4.0
54	Pyoderma gangrenosum shin	gen1	Crohnie	https://commons.wikimedia.org/wiki/File:Crohnie_Pyoderma_gangrenosum.jpg	Public domain
55	Scalp psoriasis nape hairline	gen1	Nandal P et al., Pan African Medical Journal 2022	https://pmc.ncbi.nlm.nih.gov/articles/PMC9617485/	CC BY 4.0
56	Bullous pemphigoid forearm tense bullae	gen2	Almutairi S et al., Cureus 2025	https://pmc.ncbi.nlm.nih.gov/articles/PMC12744684/	CC BY 4.0
57	Cholinergic urticaria forearm small wheals	gen2	PKeMcG	https://commons.wikimedia.org/wiki/File:A_male_displaying_cholinergic_urticaria_on_the_volar_aspect_of_the_forearm.jpg	CC BY 3.0
58	Dermographism forearm linear wheals	gen2	Gold-Olufadi S et al., Pan African Medical Journal 2021	https://pmc.ncbi.nlm.nih.gov/articles/PMC8654876/	CC BY 4.0
59	Dif linear igg basement membrane pemphigoid	gen2	Liu Z, Xu J, Medicine (Baltimore) 2025	https://pmc.ncbi.nlm.nih.gov/articles/PMC12558245/	CC BY 4.0
60	Linear iga child hand crown of jewels	gen2	Khalid et al., Cureus 2026	https://pmc.ncbi.nlm.nih.gov/articles/PMC12900970/	CC BY 4.0
61	Pemphigus foliaceus back crusted erosions	gen2	Ali et al., Clinical Case Reports 2024	https://pmc.ncbi.nlm.nih.gov/articles/PMC11583072/	CC BY 4.0
62	Collodion baby membrane	geno2	Shearer Z et al., Clin Case Rep 2023	https://pmc.ncbi.nlm.nih.gov/articles/PMC10509338/	CC BY 4.0
63	Dystrophic epidermolysis bullosa child hands mitten scarring	geno2	Mostafameraji	https://commons.wikimedia.org/wiki/File:Epidermolysis_bullosa_in_Iran-_Kerman_province_&_Balochistan_-_Photo_by_Mustafa_Meraji-_Wikipedia_free_photos_13.jpg	CC0 1.0
64	Epidermolysis bullosa child legs erosions atrophic scars	geno2	Master Sgt. Keith A. Milks (cropped)	https://commons.wikimedia.org/wiki/File:Iraqi-boy-epidermolysis_bullosa-090216-M-8096M-00-legs.jpg	Public domain
65	Ichthyosis vulgaris shins polygonal scale dark skin	geno2	Gzzz	https://commons.wikimedia.org/wiki/File:Ichthyosis_(1).jpg	CC BY-SA 4.0
66	Nf1 axillary freckling neurofibromas	geno2	Adhikari P et al., Ann Med Surg (Lond) 2024	https://pmc.ncbi.nlm.nih.gov/articles/PMC11444622/	CC BY 4.0
67	Amalgam tattoo alveolar ridge	gu	Bin im Garten, via Wikimedia Commons	https://commons.wikimedia.org/wiki/File:Amalgamt%C3%A4towierung_IMG_1707.JPG	CC BY-SA 3.0
68	Genital warts coronal sulcus	gu	Jmarchn	https://commons.wikimedia.org/wiki/File:Penile_warts.jpg	CC BY-SA 3.0
69	Genital warts penile exophytic	gu	SOA-AIDS Amsterdam	https://commons.wikimedia.org/wiki/File:SOA-Condylomata-acuminata-man.jpg	CC BY-SA 3.0
70	Histo lichen sclerosus homogenised dermis	gu	Nephron, via Wikimedia Commons	https://commons.wikimedia.org/wiki/File:Lichen_sclerosus_-_intermed_mag.jpg	CC BY-SA 3.0
71	Minor aphthous ulcer lip	gu	Genppy, via Wikimedia Commons	https://commons.wikimedia.org/wiki/File:Aphthous_ulcer.jpg	CC BY-SA 3.0
72	Vulval lichen sclerosus	gu	Mikael Häggström, via Wikimedia Commons	https://commons.wikimedia.org/wiki/File:Lichen_sclerosus.jpg	CC0 1.0
73	Finger clubbing bulbous fingertips	hairnail	Sidsandyy	https://commons.wikimedia.org/wiki/File:Clubbing_of_fingers.jpg	CC BY-SA 3.0
74	Green nail syndrome fingernail	hairnail	Carhart et al., Cureus 2024	https://pmc.ncbi.nlm.nih.gov/articles/PMC11047019/	CC BY 4.0
75	Kerion scalp crusted inflammatory plaque	hairnail	Dr.Gandikota Raghurama Rao	https://commons.wikimedia.org/wiki/File:KERION.jpg	CC BY-SA 4.0
76	Male pattern hair loss vertex	hairnail	BlaiserPascal	https://commons.wikimedia.org/wiki/File:Male-pattern_hair_loss.jpg	CC BY-SA 4.0
77	Muehrcke lines paired white bands fingernails	hairnail	Lyrl	https://commons.wikimedia.org/wiki/File:Muehrcke%27s_lines.JPG	Public domain
78	Onychomycosis great toenails t rubrum	hairnail	CDC/Dr. Edwin P. Ewing, Jr.	https://commons.wikimedia.org/wiki/File:Onychomycosis_due_to_Trichophyton_rubrum,_right_and_left_great_toe_PHIL_579_lores.jpg	Public domain
79	Tinea capitis solitary scaly patch boy	hairnail	Dr.Gandikota Raghurama Rao	https://commons.wikimedia.org/wiki/File:1402_Tinea_Capitis.jpg	CC BY-SA 4.0
80	Cellulitis leg marked margin	infect	John Campbell	https://commons.wikimedia.org/wiki/File:Cellulitis_leg_(44699140442).jpg	CC0 1.0
81	Erythema migrans upper arm	infect	CDC / James Gathany, via Wikimedia Commons	https://commons.wikimedia.org/wiki/File:Erythema_migrans_-_erythematous_rash_in_Lyme_disease_-_PHIL_9875.jpg	Public domain
82	Impetigo honey crusts chin	infect	James Heilman, MD, via Wikimedia Commons	https://commons.wikimedia.org/wiki/File:Impetigo2020.jpg	CC BY-SA 4.0
83	Kerion scalp child	infect	Grook Da Oger	https://commons.wikimedia.org/wiki/File:Kérion_02.jpg	CC BY-SA 3.0
84	Pitted keratolysis sole pits	infect	Evan Saap, via Wikimedia Commons	https://commons.wikimedia.org/wiki/File:Pitted_keratolysis_1.jpg	CC BY-SA 4.0
85	Scabies mite skin scraping microscopy	infect	Vladimir064, via Wikimedia Commons	https://commons.wikimedia.org/wiki/File:%D0%A7%D0%B5%D1%81%D0%BE%D1%82%D0%BE%D1%87%D0%BD%D1%8B%D0%B9_%D0%B7%D1%83%D0%B4%D0%B5%D0%BD%D1%8C._%D0%A1%D0%B0%D0%BC%D0%BA%D0%B0.%D0%A3%D0%B2%D0%B5%D0%BB%D0%B8%D1%87%D0%B5%D0%BD%D0%B8%D0%B5_%D1%85100.jpg	CC BY 4.0
86	Secondary syphilis palms	infect	CDC / Robert Sumpter, via Wikimedia Commons	https://commons.wikimedia.org/wiki/File:Secondary_Syphilis_on_palms_CDC_6809_lores.rsh.jpg	Public domain
87	Actinic keratoses field change dorsal hand	kc	Dr. Thomas Brinkmeier, Wikimedia Commons	https://commons.wikimedia.org/wiki/File:Aktinische_Keratosen_am_Handr%C3%BCcken,_sog._Feldkanzerisierung,_%C2%A9WIKIDERM.jpg	CC BY 4.0
88	Bcc superficial pink scaly plaque	kc	Kelly Nelson, National Cancer Institute	https://commons.wikimedia.org/wiki/File:Basal_cell_carcinoma,_superficial.jpg	Public domain
89	Bowen disease finger scaly plaque	kc	Klaus D. Peter, Wiehl, Germany, Wikimedia Commons	https://commons.wikimedia.org/wiki/File:Bowen11.jpg	CC BY 3.0 DE
90	Dermoscopy bcc arborising vessels ulceration	kc	Porumb-Andrese et al., Life 2025	https://pmc.ncbi.nlm.nih.gov/articles/PMC12842853/	CC BY 4.0
91	Histo bowen disease full thickness atypia parakeratosis	kc	Scholl et al., Academic Pathology 2025	https://pmc.ncbi.nlm.nih.gov/articles/PMC12271062/	CC BY 4.0
92	Keratoacanthoma forearm central keratin plug	kc	Karim et al., Cureus 2025	https://pmc.ncbi.nlm.nih.gov/articles/PMC12398315/	CC BY 4.0
93	Histo dfsp honeycomb fat infiltration	lymph	Oikonomidi et al., Cureus 2025	https://pmc.ncbi.nlm.nih.gov/articles/PMC12580859/	CC BY 4.0
94	Histo merkel cell carcinoma small blue cells	lymph	Nephron	https://commons.wikimedia.org/wiki/File:Merkel_cell_carcinoma_-_very_high_mag.jpg	CC BY-SA 3.0
95	Histo mf pautrier microabscess	lymph	Nephron, Wikimedia Commons	https://commons.wikimedia.org/wiki/File:Cutaneous_T-cell_lymphoma_-_very_high_mag.jpg	CC BY-SA 3.0
96	Kaposi sarcoma hiv back plaques	lymph	Abdelhamid et al., Cureus 2026	https://pmc.ncbi.nlm.nih.gov/articles/PMC13368353/	CC BY 4.0
97	Radiation angiosarcoma reconstructed breast	lymph	Aljarrah et al., ecancermedicalscience 2014	https://pmc.ncbi.nlm.nih.gov/articles/PMC3931533/	CC BY 3.0
98	Acral lentiginous melanoma sole	onc	Xavier-Júnior JCC, Munhoz T, Souza V, Campos E, Stolf H, Marques MEA (Diagnostic Pathology 2015), via Wikimedia Commons	https://commons.wikimedia.org/wiki/File:Photography_of_a_large_acral_lentiginous_melanoma.jpg	CC BY 4.0
99	Histo dfsp storiform spindle cells	onc	Mikael Haggstrom, M.D.	https://commons.wikimedia.org/wiki/File:Histopathology_of_cartwheel_pattern_in_dermatofibrosarcoma_protuberans,_original.jpg	CC0 1.0
100	Histo nodular bcc retraction clefts	onc	Scholl et al., Acad Pathol 2025	https://pmc.ncbi.nlm.nih.gov/articles/PMC12271062/	CC BY 4.0
101	Histo scc keratin pearls	onc	Scholl et al., Acad Pathol 2025	https://pmc.ncbi.nlm.nih.gov/articles/PMC12271062/	CC BY 4.0
102	Lentigo maligna scalp dermoscopy	onc	Rovesti et al., An Bras Dermatol 2021	https://pmc.ncbi.nlm.nih.gov/articles/PMC8441514/	CC BY 4.0
103	Melanoma nodular forearm nodule	onc	DermNetNZ	https://commons.wikimedia.org/wiki/File:Photography_of_nodular_melanoma.jpg	CC BY 4.0
104	Merkel cell carcinoma forearm	onc	John Paoli (University of Gothenburg), via Wikimedia Commons	https://commons.wikimedia.org/wiki/File:Merkelcellskarcinom.jpg	CC BY-SA 4.0
105	Nodular bcc nasal ala	onc	Dr. Thomas Brinkmeier (WIKIDERM), via Wikimedia Commons	https://commons.wikimedia.org/wiki/File:Nodul%C3%A4res_Basalzellkarzinom,_WIKIDERM%C2%AE.jpg	CC BY 4.0
106	Superficial spreading melanoma	onc	National Cancer Institute, via Wikimedia Commons	https://commons.wikimedia.org/wiki/File:Melanoma.jpg	Public domain
107	Black hairy tongue dorsum	oral	Com4 at English Wikipedia	https://commons.wikimedia.org/wiki/File:Black_tongue.jpg	Public domain
108	Geographic tongue dorsum	oral	Dimitrios Malamos	https://commons.wikimedia.org/wiki/File:Geographic_tongue_01.JPG	CC BY 4.0
109	Geographic tongue serpiginous borders	oral	Martanopue	https://commons.wikimedia.org/wiki/File:Geographic_tongue.JPG	CC BY-SA 3.0
110	Minor aphthous ulcers lower labial mucosa	oral	Fox9113	https://commons.wikimedia.org/wiki/File:Aphthous_stomatitis.jpg	CC BY-SA 4.0
111	Mucocele lower labial mucosa	oral	Dozenist, Wikimedia Commons	https://commons.wikimedia.org/wiki/File:Mucocele02-17-06cropped.jpg	CC BY-SA 3.0
112	Ichthyosis vulgaris polygonal scales shins	paeds1	Gzzz	https://commons.wikimedia.org/wiki/File:Ichthyosis_(2).jpg	CC BY-SA 4.0
113	Nf1 neurofibromas trunk	paeds1	Haymanj, via Wikimedia Commons	https://commons.wikimedia.org/wiki/File:Early_neurofibromatosis.jpg	Public domain
114	Tsc facial angiofibromas	paeds1	Mustaqim K, Mohd Ghazi A, Harun Nor Rashid S (Cureus 2023), via Wikimedia Commons	https://commons.wikimedia.org/wiki/File:Facial_angiofibromas_of_tuberous_sclerosis.png	CC BY 4.0
115	Aplasia cutis congenita vertex scalp	paeds2	Srivastava A et al., Cureus 2025	https://pmc.ncbi.nlm.nih.gov/articles/PMC12023630/	CC BY 4.0
116	Cmtc generalised neonate	paeds2	Boia M et al., Diagnostics 2025	https://pmc.ncbi.nlm.nih.gov/articles/PMC12385243/	CC BY 4.0
117	Congenital dermal melanocytosis sacrum buttock	paeds2	abby lu, via Wikimedia Commons	https://commons.wikimedia.org/wiki/File:Mongolianspotphoto.jpg	CC BY 2.0
118	Histo juvenile xanthogranuloma touton cells	paeds2	Nephron, via Wikimedia Commons	https://commons.wikimedia.org/wiki/File:Juvenile_xanthogranuloma_-_intermed_mag.jpg	CC BY-SA 3.0
119	Juvenile xanthogranuloma arm yellow papule	paeds2	Littlekidsdoc, via Wikimedia Commons	https://commons.wikimedia.org/wiki/File:Juvenile_xanthogranuloma.jpg	CC BY-SA 4.0
120	Erythroderma back arms islands of sparing	papsq	Mohammad2018	https://commons.wikimedia.org/wiki/File:Erythetoderma_,exfolative_dermatits.jpg	CC BY-SA 4.0
121	Lichen simplex chronicus dorsal hand dark skin	papsq	kilbad (talk)	https://commons.wikimedia.org/wiki/File:Lichen_simplex_chronicus_1.jpg	CC BY 3.0
122	Pityriasis rosea oval patches back	papsq	Aceofhearts1968	https://commons.wikimedia.org/wiki/File:Pityriasis_rosea-4.jpg	Public domain
123	Pityriasis rubra pilaris foot islands of sparing	papsq	Kelly McGauran	https://commons.wikimedia.org/wiki/File:Pityriasis_Rubra_Pilaris_6.jpg	CC BY-SA 4.0
124	Pityriasis rubra pilaris leg follicular papules	papsq	Kelly McGauran	https://commons.wikimedia.org/wiki/File:Pityriasis_Rubra_Pilaris_11.jpg	CC BY-SA 4.0
125	Seborrhoeic dermatitis nasolabial cheeks	papsq	Roymishali	https://commons.wikimedia.org/wiki/File:Seborrhoeic_dermatitis_highres.jpg	CC BY-SA 3.0
126	Dif granular iga dermal papillae dh	path	Singh et al., Cureus 2022	https://pmc.ncbi.nlm.nih.gov/articles/PMC9569416/	CC BY 3.0
127	Histo basaloid islands palisading	path	Nephron, via Wikimedia Commons	https://commons.wikimedia.org/wiki/File:Basal_cell_carcinoma_-_intermed_mag.jpg	CC BY-SA 3.0
128	Histo epidermotropic lymphocytes	path	LWozniak & KWZielinski, via Wikimedia Commons	https://commons.wikimedia.org/wiki/File:SkinTumors-PC181146.jpg	CC BY-SA 3.0
129	Histo epithelioid granulomas skin	path	Jensflorian, via Wikimedia Commons	https://commons.wikimedia.org/wiki/File:Sarcoidosis_histology_skin_involvement.jpg	CC BY-SA 4.0
130	Histo lichen planus band hypergranulosis	path	Kaniowski et al., Pharmaceuticals 2026	https://pmc.ncbi.nlm.nih.gov/articles/PMC13415833/	CC BY 4.0
131	Histo scabies mites stratum corneum	path	Lause et al., JAAD Case Reports 2023	https://pmc.ncbi.nlm.nih.gov/articles/PMC10568219/	CC BY 4.0
132	Histo scc in situ full thickness atypia	path	Valerie R. Yanofsky, Stephen E. Mercer and Robert G. Phelps (Figure 2(a), J Skin Cancer 2011; resized)	https://commons.wikimedia.org/wiki/File:Micrograph_of_squamous_cell_carcinoma_in_situ_-_100x.jpg	CC BY 4.0
133	Efavirenz photodistributed eruption upper back cutoff	photo	Isaacs T, Lehloenya R, Frontiers in Allergy 2023	https://pmc.ncbi.nlm.nih.gov/articles/PMC10192905/	CC BY 4.0
134	Porphyria cutanea tarda dorsal hand dark skin scars	photo	Isaacs T, Lehloenya R, Frontiers in Allergy 2023	https://pmc.ncbi.nlm.nih.gov/articles/PMC10192905/	CC BY 4.0
135	Porphyrinuria urine pink fluorescence wood light	photo	Sharma R et al., JAAD Case Reports 2026	https://pmc.ncbi.nlm.nih.gov/articles/PMC13452374/	CC BY 4.0
136	Peutz jeghers lip and buccal macules	pigment	Abdullah Sarhan	https://commons.wikimedia.org/wiki/File:Peutz-Jeghers-Syndrom.JPG	CC BY-SA 4.0
137	Pityriasis versicolor hyperpigmented chest	pigment	Klaus D. Peter, Wiehl, Germany	https://commons.wikimedia.org/wiki/File:Tinea.jpg	CC BY 3.0 DE
138	Vitiligo neck chest perifollicular repigmentation	pigment	Dr.Gandikota Raghurama Rao	https://commons.wikimedia.org/wiki/File:0801_Vitiligo.jpg	CC BY 4.0
139	Lip licker dermatitis perioral	psych	Stone et al., Cureus 2024	https://pmc.ncbi.nlm.nih.gov/articles/PMC11316855/	CC BY 4.0
140	Onychophagia bitten nails cuticles	psych	Jordan Canning	https://commons.wikimedia.org/wiki/File:Nail_and_cuticle_bitting.JPG	CC BY-SA 3.0
141	Self harm linear scars forearm	psych	James Heilman, MD, via Wikimedia Commons	https://commons.wikimedia.org/wiki/File:SelfHarm2017.jpg	CC BY-SA 4.0
142	Trichobezoar removed specimen	psych	Serafio-Gomez et al., Cureus 2026	https://pmc.ncbi.nlm.nih.gov/articles/PMC12854385/	CC BY 4.0
143	Erythema nodosum shins bilateral	reactive	James Heilman, MD	https://commons.wikimedia.org/wiki/File:ENlegs.JPG	CC BY-SA 3.0
144	Granuloma annulare palisading histology	reactive	Nephron	https://commons.wikimedia.org/wiki/File:Granuloma_annulare_-_high_mag.jpg	CC BY-SA 3.0
145	Pyoderma gangrenosum necrotic leg ulcers	reactive	Tetcu Mircea Rares	https://commons.wikimedia.org/wiki/File:Pyoderma_gangrenosum_(1).jpg	CC BY-SA 4.0
146	Sarcoidosis lupus pernio nose cheek	reactive	M. Sand, D. Sand, C. Thrandorf, V. Paech, P. Altmeyer, F. G. Bechara	https://commons.wikimedia.org/wiki/File:Lupus_pernio_01.jpg	CC BY 2.0
147	Sweet syndrome forearm plaques	reactive	Volpe, Cureus 2016	https://pmc.ncbi.nlm.nih.gov/articles/PMC4866868/	CC BY 3.0
148	Bland altman two devices	research	Borne	https://commons.wikimedia.org/wiki/File:Bland-Altman-Plot.png	CC BY-SA 3.0
149	Forest plot pooled odds ratio	research	James Grellier	https://commons.wikimedia.org/wiki/File:Generic_forest_plot.png	CC BY-SA 3.0
150	Funnel plot seven trials	research	Sardmeta1	https://commons.wikimedia.org/wiki/File:Funnel_plot_depicting_asymmetry_Sept_2015.jpg	CC BY-SA 3.0
151	Risk of bias 2 traffic light	research	Cian O'Mahony, Maryanne Brassil, Gillian Murphy, Conor Linehan	https://commons.wikimedia.org/wiki/File:Risk_of_bias_assessment_from_the_review_%22The_efficacy_of_interventions_in_reducing_belief_in_conspiracy_theories%22.tif	CC BY 4.0
152	Roc curves two methods	research	Gforman44	https://commons.wikimedia.org/wiki/File:Example_ROC_curves.png	CC BY-SA 3.0
153	Acne keloidalis nuchae occiput dark skin	soc	Patel et al., Cureus 2025	https://pmc.ncbi.nlm.nih.gov/articles/PMC12256024/	CC BY 4.0
154	Ccca vertex scarring alopecia	soc	Palmer et al., Life (Basel) 2023	https://pmc.ncbi.nlm.nih.gov/articles/PMC10142262/	CC BY 4.0
155	Lupus pernio nose lip	soc	Safadi et al., JAAD Case Reports 2024	https://pmc.ncbi.nlm.nih.gov/articles/PMC11437245/	CC BY 4.0
156	Pityriasis versicolor hypopigmented neck chest dark skin	soc	Sandeyl et al., Clinical Case Reports 2026	https://pmc.ncbi.nlm.nih.gov/articles/PMC13277293/	CC BY 4.0
157	Tinea capitis scaly patch child	soc	Gzzz	https://commons.wikimedia.org/wiki/File:Teigne_tondante_enfant.jpg	CC BY-SA 4.0
158	Vitiligo hands dark skin	soc	James Heilman, MD, via Wikimedia Commons	https://commons.wikimedia.org/wiki/File:Vitiligo2.JPG	CC BY-SA 3.0
159	Keloid abdominal scar	surg	Htirgan	https://commons.wikimedia.org/wiki/File:Keloid,_Post_Surgical.JPG	CC BY-SA 3.0
160	Meshed split skin graft ankle	surg	Giftrapped	https://commons.wikimedia.org/wiki/File:Skin_Graft_on_Ankle_after_Third_Degree_Burns.jpg	CC BY-SA 4.0
161	Paramedian forehead flap pedicle nose	surg	Fernandes et al., Cureus 2025	https://pmc.ncbi.nlm.nih.gov/articles/PMC12461767/	CC BY 4.0
162	Acanthosis nigricans axilla skin tags	systemic	Kubicka-Wołkowska et al., BMC Urology 2014	https://pmc.ncbi.nlm.nih.gov/articles/PMC4239373/	CC BY 4.0
163	Dermatomyositis gottron papules hand	systemic	Mohammad2018	https://commons.wikimedia.org/wiki/File:Gottron_papules_.dermatomyocitis.jpg	CC BY-SA 4.0
164	Eruptive xanthomas elbow clustered	systemic	Hafthar et al., Cureus 2026	https://pmc.ncbi.nlm.nih.gov/articles/PMC13348998/	CC BY 4.0
165	Erythema nodosum shins	systemic	Doc James	https://commons.wikimedia.org/wiki/File:EN2021.jpg	CC BY-SA 4.0
166	Xanthelasma palpebrarum eyelids	systemic	Oleg Tymofii	https://commons.wikimedia.org/wiki/File:Eyelid_Xanthelasma.jpg	CC BY-SA 3.0
167	Angiokeratoma of fordyce scrotum	vanom	Jlcarter2	https://commons.wikimedia.org/wiki/File:Angiokeratoma_of_the_Scrotum_3.jpg	CC BY-SA 3.0
168	Infantile haemangioma involuting arm grey white areas	vanom	Gstk	https://commons.wikimedia.org/wiki/File:Infantile_hemangioma.jpg	CC BY-SA 4.0
169	Pyogenic granuloma finger red dome	vanom	kilbad	https://commons.wikimedia.org/wiki/File:Pyogenic_granuloma_on_a_finger-2.jpg	CC BY 3.0
170	Venous malformation thenar hand	vanom	Santos et al., Jornal Vascular Brasileiro 2026	https://pmc.ncbi.nlm.nih.gov/articles/PMC13446002/	CC BY 4.0
171	Iga vasculitis palpable purpura feet	vasc	Ajd52	https://commons.wikimedia.org/wiki/File:Plamica_w_zespole_Henocha-Schonleina.JPG	CC BY-SA 3.0
172	Leukocytoclastic vasculitis histology nuclear dust	vasc	Nephron	https://commons.wikimedia.org/wiki/File:Leukocytoclastic_vasculitis_--_intermed_mag.jpg	CC BY-SA 3.0
173	Livedo reticularis thigh	vasc	డా. గన్నవరపు నరసింహమూర్తి	https://commons.wikimedia.org/wiki/File:Livedo_reticularis.jpg	CC0 1.0
174	Raynaud phenomenon digital pallor	vasc	TobiasGruen	https://commons.wikimedia.org/wiki/File:Raynaud-RechteHand.jpg	CC BY-SA 4.0
175	Cutaneous leishmaniasis ulcer dorsal hand	viral	CDC/Dr D.S. Martin (PHIL 352), public domain, via Wikimedia Commons	https://commons.wikimedia.org/wiki/File:Skin_ulcer_due_to_leishmaniasis,_hand_of_Central_American_adult_3MG0037_lores.jpg	Public domain
176	Hand foot mouth soles	viral	Ngufra	https://commons.wikimedia.org/wiki/File:Hand_foot_and_mouth_disease_on_child_feet.jpg	CC BY-SA 3.0
177	Herpes zoster trunk band	viral	Gzzz	https://commons.wikimedia.org/wiki/File:Zona_(herpes_zoster).jpg	CC BY-SA 4.0
178	Herpetic whitlow child finger	viral	James Heilman, MD, via Wikimedia Commons	https://commons.wikimedia.org/wiki/File:Herpetic_whitlow_in_young_child.jpg	CC BY-SA 3.0
179	Histo verruca vulgaris koilocytes	viral	Nephron, via Wikimedia Commons	https://commons.wikimedia.org/wiki/File:Verruca_vulgaris_-_intermed_mag.jpg	CC BY-SA 3.0
180	Kaposi sarcoma violaceous plaques	viral	National Cancer Institute (AV-8500-3620), public domain, via Wikimedia Commons	https://commons.wikimedia.org/wiki/File:Kaposi%27s_Sarcoma.jpg	Public domain
181	Measles rash toddler back	viral	CDC Public Health Image Library (PHIL 4497), public domain	https://commons.wikimedia.org/wiki/File:Measles_rash_PHIL_4497_lores.jpg	Public domain
182	Diabetic neuropathic heel ulcer	wound	Jonathan Moore	https://commons.wikimedia.org/wiki/File:Neuropathic_heel_ulcer_diabetic.jpg	CC BY 3.0
183	Larval therapy foot ulcer	wound	Alexsey Nosenko / Maggot Medicine, via Wikimedia Commons	https://commons.wikimedia.org/wiki/File:Maggot_debridement_therapy_on_a_diabetic_foot.jpg	CC BY 3.0
184	Marjolin ulcer burn scar shoulder	wound	Taji et al., Cureus 2025	https://pmc.ncbi.nlm.nih.gov/articles/PMC11826102/	CC BY 4.0
185	Pressure ulcer buttock sloughy crater	wound	Ibrahim Husain Meraj	https://commons.wikimedia.org/wiki/File:Pressure_Ulcer_grade_4.jpg	CC BY-SA 4.0
186	Pyoderma gangrenosum back shoulder	wound	Monopol	https://commons.wikimedia.org/wiki/File:Pyoderma_gangrenosum_01.jpg	CC BY-SA 3.0
187	Venous leg ulcer ankle gaiter	wound	Ashashyou	https://commons.wikimedia.org/wiki/File:Chronic_venous_insufficiency_%26_Venous_ulcer.jpg	CC BY-SA 4.0

3. Where our questions come from

StudyDerm questions, answers and explanations are written by us as original educational items. They are written with reference to published guidance and literature, such as national guidelines (NICE, British Association of Dermatologists, SIGN, BNF and MHRA), manufacturer product information, published journal articles and standard textbooks. Each item carries its source links, which learners can open from the app.

Our authoring rules say:

Items are written from guidelines and literature, not from real exam questions or recalls.
Wording, tables and figures are not copied from commercial textbooks or question books. Facts are used, and items are written fresh.
Vendor or competitor question banks, recalled exam questions, Wikipedia, blogs and forums are not acceptable sources.
Some supporting links go to reputable secondary sites (such as DermNet). These are supporting references only and may not be the sole source for an item.

We therefore do not claim to reproduce any examining body's exam content, and we do not intend to. This is our authoring rule and our review standard. We cannot give an absolute guarantee about every item, and we say so openly. If you believe any item copies material it should not, tell us (section 4).

The names of organisations, guidelines and publications above are used only to identify the sources of information. We are not connected to them.

4. Takedown and contact

If you made an image we use and think it is credited wrongly, or you think a licence has been misapplied, or you believe any content infringes your rights, email support@studyderm.app with:

the question or page where you saw it,
what you believe is wrong, and
your name and a way to contact you.

We will acknowledge your message within 2 working days, and we will remove or correct the item while we look into it where there is a credible concern. We keep a log of reports and what we did. For the full process see Content Accuracy and Complaints.