Acneiform eruptions are dermatoses that resemble acne vulgaris. Lesions may be papulopustular, nodular, or cystic. While acne vulgaris typically consists of comedones, acneiform eruptions (such as acneiform drug eruptions) usually lack comedones clinically. See the image below.
Acnelike eruptions develop as a result of infections, hormonal or metabolic abnormalities, genetic disorders, and drug reactions.
Those entities included in this discussion are nevus comedonicus, eruptive hair cysts, tuberous sclerosis, [1, 2] amineptine acne, steroid acne, chloracne, acneiform drug eruptions, gram-negative folliculitis, eosinophilic pustular folliculitis, Pityrosporum folliculitis, coccidioidomycosis, secondary syphilis, [3, 4] sporotrichosis,  rosacea, and perioral dermatitis.
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