Nevus comedonicus
Encyclopedia
Nevus comedonicus is characterized by closely arranged, grouped, often linear, slightly elevated papule
Papule
A papule is a circumscribed, solid elevation of skin with no visible fluid, varying in size from a pinhead to 1 cm.With regard to the quote "...varying in size from a pinhead to 1cm," depending on which text is referenced, some authors state the cutoff between a papule and a plaque as 0.5cm,...

s that have at their center keratinous plugs resembling comedones.
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