1.NounA skin condition, usually of the face, that is common in adolescents. It is characterised by red pimples, and is caused by the inflammation of sebaceous glands through bacterial infection; acne vulgaris.
"He struggled with severe acne during his teenage years.; The dermatologist prescribed a cream to treat her acne."
2.NounA pattern of blemishes in an area of skin resulting from the skin condition.
3.NounAny of several other skin conditions that resemble acne vulgaris.