Also known as: acne keloidalis
- Mainly affects young black men
- Most common on the occiput and neck
- Follicular papules and pustules progressing to exophytic keloidal plaques (scarring alopecia)
- Early lesions show pustular folliculitis with comedal dilatation of the follicles and follicular rupture.
- Later lesions show a dense dermal scar with or without a keloidal appearance and naked hair follicles surrounded by a mononuclear inflammatory infiltrate rich in plasma cells.