A Mysterious Dark Patch on the Palm

A 19-year-old presents with a growing dark spot on her palm. Explore the Differential Diagnosis, from melanoma to a surprising fungal infection.

Tinea nigra


A 19-year-old woman presented with a 6-month history of a slowly growing asymptomatic dark spot on her left palm. Examination was notable for a nonscaling, nonpalpable brown patch (left). Dermatoscopy revealed pigmented spicules, and palmar skin scrapings were prepared (right). What is the most likely diagnosis?

What is the most likely diagnosis?

Acral lentiginous melanoma
Lichen planus
Secondary syphilis
Tinea nigra
Tinea versicolor

Dermatology, Dermatoscopy, Fungal Infection, Hyperpigmentation, Tinea nigra

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