The myth of black henna.

A 44-year-old woman presented with an eczematous, oozing eruption on her head, the back of her neck, and ears (Figure) that appeared one day after she had used a henna dye on her hair. She was aware of her allergy to permanent hair dyes, but her dermatologist approved of her use of natural dyes, such as henna. The dermatitis resolved within 1 week after she received an injection of combined betamethasone dipropionate 5 mg and betamethasone sodium phosphate 2 mg (Diprospan; Schering-Plough, Kenilworth, NJ).