Severe erythema and hyperpigmentation following chemical peel. (A) The patient had marked erythema and hyperpigmentation 3 days after chemical peel treatment (70% glycolic acid) in combination with low-dose oral isotretinoin (10 mg once daily). (B) Detail of the forehead showing isolated erosions. The arrow indicates a crusty exudate. (C) Marked erythema of the neck.