KLINIKFUCHS › Spot-diagnosis quiz › Skin tumours & naeviDermatology spot-diagnosis quiz: Skin tumours & naevi
Melanoma, basal cell carcinoma, naevi, keratoses and other skin neoplasms – 41 real clinical images from Wikimedia Commons. Pick the best diagnosis for each case; the answer links to the knowledge base where available.
Correct: 0 of 0 answered · 41 cases
Case 1 of 41
Future FamDoc, „Actinic keratosis on ear", CC BY-SA 4.0, via Wikimedia Commons · CC BY-SA 4.0 · Source Which diagnosis fits best?
Lentigo maligna Actinic keratosis Bowen disease Keratoacanthoma
Answer: Actinic keratosis · More on Actinic keratosis in the knowledge base →
Case 2 of 41
Bin im Garten, „Basaliom am Nasenrücken 2", CC BY-SA 3.0, via Wikimedia Commons · CC BY-SA 3.0 · Source Which diagnosis fits best?
Superficial spreading melanoma Trichoepithelioma Basal cell carcinoma Dermatofibroma
Answer: Basal cell carcinoma · More on Basal cell carcinoma in the knowledge base →
Case 3 of 41
Dannii Brighton, „Blue Nevus", CC BY-SA 3.0, via Wikimedia Commons · CC BY-SA 3.0 · Source Which diagnosis fits best?
Basal cell carcinoma Dermatofibroma Superficial spreading melanoma Blue naevus
Answer: Blue naevus
Case 4 of 41
unbekannt (Commons-Nutzer), „Cornu cutaneum", CC BY-SA 3.0, via Wikimedia Commons · CC BY-SA 3.0 · Source Which diagnosis fits best?
Verruca vulgaris Cutaneous horn Actinic keratosis Verrucae vulgares
Answer: Cutaneous horn
Case 5 of 41
Jmarchn, „Pigmented and tenderness dermatofibroma", CC BY-SA 3.0, via Wikimedia Commons · CC BY-SA 3.0 · Source Which diagnosis fits best?
Lipoma Epidermal cyst Superficial spreading melanoma Dermatofibroma
Answer: Dermatofibroma · More on Dermatofibroma in the knowledge base →
Case 6 of 41
0x6adb015 (Wikimedia Commons), „DysplasticNevusSyndrome", CC BY-SA 3.0, via Wikimedia Commons · CC BY-SA 3.0 · Source Which diagnosis fits best?
Dysplastic naevus Dermatofibroma Lentigo maligna Keratoacanthoma
Answer: Dysplastic naevus
Case 7 of 41
Dermanonymous, „Epidermal Inclusion Cyst“, CC BY-SA 4.0, via Wikimedia Commons · CC BY-SA 4.0 · Source Which diagnosis fits best?
Pilomatricoma Lipoma Epidermoid cyst Epidermal cyst
Answer: Epidermoid cyst
Case 8 of 41
Omar Bari, Philip R. Cohen, „Photograph of lentigo maligna melanoma", CC BY 3.0, via Wikimedia Commons · CC BY 3.0 · Source Which diagnosis fits best?
Seborrhoeic keratosis Solar lentigo Lentigo maligna Superficial spreading melanoma
Answer: Lentigo maligna · More on Lentigo maligna in the knowledge base →
Case 9 of 41
Beyond My Ken, „Liver spots, light-skinned Caucasian man, age 63", CC BY-SA 4.0, via Wikimedia Commons · CC BY-SA 4.0 · Source Which diagnosis fits best?
Seborrhoeic keratosis Actinic keratosis Pityriasis alba Solar lentigo
Answer: Solar lentigo
Case 10 of 41
James Heilman, MD, „LipomaBack", CC BY-SA 3.0, via Wikimedia Commons · CC BY-SA 3.0 · Source Which diagnosis fits best?
Lipoma Epidermoid cyst Fibrofolliculoma (Birt-Hogg-Dubé) Epidermal cyst
Answer: Lipoma
Case 11 of 41
National Cancer Institute (unbekannter Fotograf), „Melanoma (4)", Public Domain, via Wikimedia Commons · Public domain · Source Which diagnosis fits best?
Spitz naevus Superficial spreading melanoma Basal cell carcinoma Keratoacanthoma
Answer: Superficial spreading melanoma · More on Melanoma in the knowledge base →
Case 12 of 41
M. Sand, D. Sand, C. Thrandorf, V. Paech, P. Altmeyer, F. G. Bechara, „Congenital melanocytic nevus 01", CC BY 2.0, via Wikimedia Commons · CC BY 2.0 · Source Which diagnosis fits best?
Dysplastic naevus Dermatofibroma Melanocytic naevus Superficial spreading melanoma
Answer: Melanocytic naevus
Case 13 of 41
Wikindrea, „Mycosis Fungoides Before Sun and Cartamo", CC BY-SA 4.0, via Wikimedia Commons · CC BY-SA 4.0 · Source Which diagnosis fits best?
Atopic dermatitis Folliculitis decalvans Mycosis fungoides Seborrhoeic dermatitis
Answer: Mycosis fungoides · More on Mycosis fungoides in the knowledge base →
Case 14 of 41
Dr. Wonko, CC BY-SA 4.0, via Wikimedia Commons · CC BY-SA 4.0 · Source Which diagnosis fits best?
Naevus sebaceus (Jadassohn) Rosacea Port-wine stain (naevus flammeus) Sturge-Weber syndrome
Answer: Port-wine stain (naevus flammeus)
Case 15 of 41
Evan Saap, „Pitted keratolysis 1", CC BY-SA 4.0, via Wikimedia Commons · CC BY-SA 4.0 · Source Which diagnosis fits best?
Intertrigo Pitted keratolysis (keratoma sulcatum) Tinea pedis Erythrasma
Answer: Pitted keratolysis (keratoma sulcatum)
Case 16 of 41
Assafn, „Seborrheic keratosis closup", CC BY-SA 4.0, via Wikimedia Commons · CC BY-SA 4.0 · Source Which diagnosis fits best?
Seborrhoeic keratosis Basal cell carcinoma Dermatofibroma Atypical fibroxanthoma (AFX)
Answer: Seborrhoeic keratosis
Case 17 of 41
Klaus D. Peter, Wiehl, CC BY 3.0 DE, via Wikimedia Commons · CC BY 3.0 DE · Source Which diagnosis fits best?
Trichoepithelioma Syringoma Sebaceous hyperplasia Comedonal acne
Answer: Sebaceous hyperplasia
Case 18 of 41
Klaus D. Peter, Wiehl, Germany, „Trichoepithelioma", CC BY 3.0 de, via Wikimedia Commons · CC BY 3.0 de · Source Which diagnosis fits best?
Microcystic adnexal carcinoma Fibrofolliculoma (Birt-Hogg-Dubé) Trichoepithelioma Syringoma
Answer: Trichoepithelioma
Case 19 of 41
M. Sand, D. Sand, C. Thrandorf, V. Paech, P. Altmeyer, F. G. Bechara, „Adenoma sebaceum 01", CC BY 2.0, via Wikimedia Commons · CC BY 2.0 · Source Which diagnosis fits best?
Sebaceous hyperplasia Rosacea Angiofibromas (adenoma sebaceum) in tuberous sclerosis Fibrofolliculoma (Birt-Hogg-Dubé)
Answer: Angiofibromas (adenoma sebaceum) in tuberous sclerosis
Case 20 of 41
Jlcarter2, „Angiokeratoma of the Scrotum 1", CC BY-SA 3.0, via Wikimedia Commons · CC BY-SA 3.0 · Source Which diagnosis fits best?
Superficial spreading melanoma Kaposi sarcoma Petechiae in immune thrombocytopenia (platelets 3/nl) Angiokeratoma
Answer: Angiokeratoma
Case 21 of 41
unbekannt (Commons-Nutzer), „Epidermal Cyst ear", CC BY-SA 3.0, via Wikimedia Commons · CC BY-SA 3.0 · Source Which diagnosis fits best?
Epidermal cyst Abscess Lipoma Trichoepithelioma
Answer: Epidermal cyst
Case 22 of 41
Klaus D. Peter, Wiehl, Germany, „Spinaliom3", CC BY 3.0 DE, via Wikimedia Commons · CC BY 3.0 DE · Source Which diagnosis fits best?
Keratoacanthoma Actinic keratosis Basal cell carcinoma Squamous cell carcinoma
Answer: Squamous cell carcinoma · More on Cutaneous squamous cell carcinoma in the knowledge base →
Case 23 of 41
Tontonflingueur, „Dermatofibrosarcome facial 01", CC BY-SA 4.0, via Wikimedia Commons · CC BY-SA 4.0 · Source Which diagnosis fits best?
Dermatofibrosarcoma protuberans Basal cell carcinoma Dermatofibroma Lipoma
Answer: Dermatofibrosarcoma protuberans · More on Dermatofibrosarcoma protuberans in the knowledge base →
Case 24 of 41
Midasblenny, „Cherry angioma", CC BY-SA 4.0, via Wikimedia Commons · CC BY-SA 4.0 · Source Which diagnosis fits best?
Basal cell carcinoma Pyogenic granuloma Haemangioma Superficial spreading melanoma
Answer: Haemangioma
Case 25 of 41
Tosti (2026), „Halo Nevus as a Self-Limited Model of Melanocyte Autoimmunity: Bridging Vitiligo, Immune Resolution, and Tumor Immunology—A Narrative Review", CC BY 4.0, via Wikimedia Commons · CC BY 4.0 · Source Which diagnosis fits best?
Halo naevus Alopecia areata Dysplastic naevus Amelanotic melanoma
Answer: Halo naevus
Case 26 of 41
unbekannt (Commons-Nutzer), „Eccrine hydrocystoma 01", CC BY 2.0, via Wikimedia Commons · CC BY 2.0 · Source Which diagnosis fits best?
Epidermal cyst Trichoepithelioma Syringoma Eccrine hidrocystoma
Answer: Eccrine hidrocystoma
Case 27 of 41
Gstk, „Infantile hemangioma, flat", CC BY-SA 4.0, via Wikimedia Commons · CC BY-SA 4.0 · Source Which diagnosis fits best?
Infantile haemangioma Angiosarcoma Haemangioma Pyogenic granuloma
Answer: Infantile haemangioma
Case 28 of 41
Klaus D. Peter, Wiehl, Germany, „Spinaliom", CC BY 3.0 DE, via Wikimedia Commons · CC BY 3.0 DE · Source Which diagnosis fits best?
Verrucae vulgares Spitz naevus Keratoacanthoma Actinic keratosis
Answer: Keratoacanthoma
Case 29 of 41
Dr. Thomas Brinkmeier, „Amelanotisches, malignes Melanom, ©wikiderm.de", CC BY 4.0, via Wikimedia Commons · CC BY 4.0 · Source Which diagnosis fits best?
Basal cell carcinoma Amelanotic melanoma Keratoacanthoma Pyogenic granuloma
Answer: Amelanotic melanoma · More on Melanoma in the knowledge base →
Case 30 of 41
Birthmarkshare, „Nevus anemicus", Public Domain, via Wikimedia Commons · Public domain · Source Which diagnosis fits best?
Idiopathic guttate hypomelanosis Pityriasis alba Naevus depigmentosus Naevus anaemicus
Answer: Naevus anaemicus
Case 31 of 41
Klaus D. Peter, Wiehl, Germany, „Neurofibroma03", CC BY 3.0 de, via Wikimedia Commons · CC BY 3.0 de · Source Which diagnosis fits best?
Albinism Naevus depigmentosus Neurofibromatosis type 1 Café-au-lait macules
Answer: Neurofibromatosis type 1
Case 32 of 41
Brendan Thomas, M.D., „Porokeratosis DSAP“, CC BY-SA 3.0, via Wikimedia Commons · CC BY-SA 3.0 · Source Which diagnosis fits best?
Bowen disease Dermatofibroma Porokeratosis Actinic keratosis
Answer: Porokeratosis · More on Porokeratosis in the knowledge base →
Case 33 of 41
Onkarappa Mangala Y, „Image PCGD-TCL", CC BY 4.0, via Wikimedia Commons · CC BY 4.0 · Source Which diagnosis fits best?
Pyoderma gangrenosum Mycosis fungoides Cutaneous lymphoma Primary cutaneous γδ T-cell lymphoma
Answer: Primary cutaneous γδ T-cell lymphoma
Case 34 of 41
kilbad, „Pyogenic granuloma on a finger-1", CC BY 3.0, via Wikimedia Commons · CC BY 3.0 · Source Which diagnosis fits best?
Spitz naevus Basal cell carcinoma Superficial spreading melanoma Pyogenic granuloma
Answer: Pyogenic granuloma
Case 35 of 41
Nictitate, „A blue nevus on the shin", CC0, via Wikimedia Commons · CC0 · Source Which diagnosis fits best?
Syringoma Blue naevus Milia Tyndall effect (blue naevus)
Answer: Tyndall effect (blue naevus)
Case 36 of 41
Monica Giovannini, Carmelo D'Atri, Quirino Piubello, Annamaria Molino, „Paget-Karzinom 05", CC BY-SA 2.0, via Wikimedia Commons · CC BY-SA 2.0 · Source Which diagnosis fits best?
Atypical fibroxanthoma (AFX) Basal cell carcinoma Mammary Paget disease Psoriasis vulgaris (plaque psoriasis)
Answer: Mammary Paget disease
Case 37 of 41
Kingsley C Ekwueme, Hani D Zakhour, Nigel J Parr, „Paget-Karzinom 01", CC BY-SA 2.0, via Wikimedia Commons · CC BY-SA 2.0 · Source Which diagnosis fits best?
Extramammary Paget disease Mammary Paget disease Superficial spreading melanoma Psoriasis vulgaris (plaque psoriasis)
Answer: Extramammary Paget disease · More on Extramammary Paget disease in the knowledge base →
Case 38 of 41
Littlekidsdoc, „Juvenile xanthogranuloma", CC BY-SA 4.0, via Wikimedia Commons · CC BY-SA 4.0 · Source Which diagnosis fits best?
Juvenile xanthogranuloma Langerhans cell histiocytosis Dermatofibroma Xanthelasma palpebrarum
Answer: Juvenile xanthogranuloma
Case 39 of 41
SafinDinar, „Врожденная не инволюционирующая гемангиома (Noninvoluting congenital hemangioma) (NICH)", CC BY-SA 4.0, via Wikimedia Commons · CC BY-SA 4.0 · Source Which diagnosis fits best?
Non-involuting congenital haemangioma (NICH) Pyogenic granuloma Angiosarcoma Haemangioma
Answer: Non-involuting congenital haemangioma (NICH)
Case 40 of 41
Spectrum11, „Borrelial lymphocytoma", CC0, via Wikimedia Commons · CC0 · Source Which diagnosis fits best?
Superficial spreading melanoma Granuloma annulare Mycosis fungoides Cutaneous pseudolymphoma (borrelial lymphocytoma)
Answer: Cutaneous pseudolymphoma (borrelial lymphocytoma) · More on Cutaneous pseudolymphoma in the knowledge base →
Case 41 of 41
kilbad, „Pseudoxanthoma elasticum 3", CC BY 3.0, via Wikimedia Commons · CC BY 3.0 · Source Which diagnosis fits best?
Pseudoxanthoma elasticum (PXE, Grönblad-Strandberg) Cutis laxa Ehlers-Danlos syndrome Limited systemic sclerosis (CREST syndrome)
Answer: Pseudoxanthoma elasticum (PXE, Grönblad-Strandberg)
Learning quiz for medical education. Does not replace a clinical examination or an individual diagnosis. Images: Wikimedia Commons, author and licence below each image; resized for the web.
