[Nevus comedonicus. A rare skin disease of the hair follicles].

Naevus comedonicus was a rare skin disorder caused by a developmental defect in hair follicles, leading to the formation of keratin plugs that expanded the follicles and created dark, vaulted crypts on the skin, primarily on the face, neck, and trunk. Although usually asymptomatic, it could be complicated by infection and scarring, but no malignancy was reported. Local treatment with retinoic acid helped accelerate exfoliation and prevent keratin plug formation, though it did not eliminate existing skin crypts and pits. Surgical treatment was considered the best alternative for addressing the condition.