Tinea nigra usually presents as a brown to black macule on the palmar
or plantar skin and is sometimes misdiagnosed as a malignant melanoma
or as a junctional nevus, prompting unnecessary surgical procedures an
d anguish for the patient. Superficial scraping of the skin for micros
copic inspection with potassium hydroxide reveals pigmented hyphae, ea
sily confirming the diagnosis of tinea nigra.