As time goes on the bumps become small scars and then the small scars may greatly enlarge to become keloids . The scars are hairless and can form a band along the hairline. The cause of acne keloidalis nuchae is not known. It may be a form of dermatitis or a form of acne . In most cases there are ingrown hairs which irritate the wall of the hair follicle resulting in inflammation.
Treatment Unfortunately acne keloidalis often persists despite a variety of treatments.