Tinea nigra is presented with non scaly , flat, brown to black macular lesions of the sole and palms.
Tinea nigra is commonly present in tropical countries. Tinea nigra is causesd by a dimorphic fungus known as Exophilia werneckii ( dimorphic fungus). Exophilia werneckii may be detected by microscopic examination of the skin scarping in the potassium hydroxide preparation. The microscopic finding may reveals brown pigmented yeast cells and hyphae.
Exophilia werneckii is most commonly present in the soil. The common mode of transmission is through injury. Black colonies may be found in the culture which confirmed the present of tinea nigra.
Tinea nigra is prevented with good / proper hygiene. The treatment may include topical application of salicylic acid.
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