Late Onset Nevus Comedonicus of Scalp: A Rare Site for an Uncommon Condition

The document reported a rare case of nevus comedonicus (NC) on the scalp of a 19-year-old woman, which is an uncommon site for this condition. NC is a developmental abnormality of the pilosebaceous unit, characterized by keratin-filled pits resembling open comedones. It typically appears during childhood or adolescence and is most commonly found on the face, neck, trunk, and arms. The patient presented with a pruritic patch of alopecia on her scalp, which developed over two years, featuring discrete hyperpigmented raised papules. This case was notable for its rarity and the atypical location of the lesions.