Trichostasis spinulosa: a clinical simulant of acne open comedones.

Trichostasis spinulosa is a disorder of the pilosebaceous follicles that may simulate acne open comedones. It is a commonly reported cosmetic annoyance in adults but not children. A review of the literature and a case of trichostasis spinulosa in a 13-year-old black girl with a history of onset at 18 months of age are presented.