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EAG Charitable Foundation Pimples blackheads and whiteheads oh my What is acne. Acne acne vulgaris common acne is a disease of the hair follicles of the face chest and back that affects almost all teenagers during puberty. Acne is primarily a hormonal condition driven by male or androgenic hormones which typically become active during the teenage years. Sensitivity to such hormones combined with bacteria on the skin and fatty acids within oil glands cause acne.