Nevus comedonicus (also known as a comedo nevus) is characterized by closely arranged, grouped, often linear, slightly elevated papules that have at their center keratinous plugs resembling comedones.
Nevus comedonicus comprises of groups of pits filled with black keratinous plugs resembling blackheads, with inflammatory acne lesions developing later. Nevus comedonicus is caused by a defect in the development of the hair follicle. Lesions may develop any time from birth to middle age.

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