Black piedra
(Infection in hair)
Black piedra is infection of hair shaft; causes by black yeast.
It produce hard, dark nodule on shaft of infected scalp hair.
Laboratory Diagnosis
Specimen collection
Infected hair with nodule.
KOH preparation
Infected hairs shaft show broken nodule
Culture on SDH
Incubated at 25 degree Celsius for 3 week.
Treatment
Clip or shave Infected area and apply antifungal agent like;
5% sulfur ointment
Benzoic and salicylic acid in combination.
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