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Acne vulgaris: Papules, papulopustules, pustules, nodules, and atrophic scars, as well as patulous ostia of infundibula that previously housed a comedo.
Acne conglobata. Comedones, papules, papulopustules, and honey-colored and hemorrhagic crusts, some of which have peculiar geometric outlines by virtue of lesions having become confluent, of acne conglobata.
Steroid acne. Papules, situated mostly in the center of the face, are a result of topical application for months of high-potency corticosteroids, of steroid acne.
Steroid acne. Papules and papulopustules, each situated at the ostium of an infundibulum, a result of systemic administration of corticosteroid (steroid acne).
A plum-colored nodule, the result of rupture of an infundibular cyst, situated above a linear scar within which are dilated ostia of infundibula, each of which represents an opening of a pilonidal sinus.
Favre-Racouchot syndrome. Comedones and milia (small infundibular cysts) of Favre-Racouchot syndrome consequent to injury of skin by rays of the sun received for many decades. There also are seborrheic keratoses.