Nevus Comedonicus: A Rare Skin Disease of the Hair Follicles

Naevus comedonicus was a rare skin disorder resulting from defective development of hair follicles, where undifferentiated epithelium produced keratin that formed plugs, leading to dark, vaulted crypts on the skin, primarily on the face, neck, and trunk. The condition was usually asymptomatic but could be complicated by infection and scarring, with no reported malignancy. Local treatment with retinoic acid accelerated exfoliation and prevented keratin plug formation but did not eliminate skin crypts and pits. Surgical treatment was considered the best alternative.