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To the Editor.—
An interesting problem was recently brought to my attention after I examined a young girl with tinea capitis. After positive results of Wood's light examination and a positive culture for Microsporum audouinii, she was treated with orally administered griseofulvin and asked to shampoo daily with chloroxine (Capitrol Cream Shampoo). After six weeks of therapy, the patient's condition was essentially cleared; however, the results of Wood's light examination remained positive, with a yellow-green fluorescence. Due to the color of the chloroxine shampoo, I decided to perform a Wood's light examination on a normal scalp after shampooing with this shampoo. To my surprise, there was a brilliant yellowgreen fluorescence.This might be a potential problem in following up patients with tinea capitis in whom resolution of positive results of a Wood's light examination is assumed to be indicative of a cure.
Johnson ML. Fluorescence With Chloroxine Shampoo. Arch Dermatol. 1979;115(5):641. doi:10.1001/archderm.1979.04010050065044