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Image Number 750 (Tinea nigra)

 
Morphology:
Patch

Diagnosis: Tinea nigra

Site: Hand,palm

Sex: M

Age: 50

Type: Clinical

Description: Hyperpigmented patch

Submitted by: Shahbaz Janjua

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Differential Diagnosis

History: Tinea nigra is an uncommon superficial dermatomycosis usually caused by Hortaea werneckii.  The infection appears as a hyperpigmented macule, which most commonly  occurs on the palms but soles may also get involved. The pigmentary change in the skin results in a dark-colored macule due to the accumulation of a melaninlike substance in the fungus. Tinea nigra is believed to occur as a result of inoculation from a contamination source such as soil, sewage, wood, or compost subsequent to trauma in the affected area.
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