Dear reader, the video is a little lower. Acne, or acne vulgaris, is a long-term skin condition caused by clogged hair follicles from oil and dead skin cells. It leads to blackheads, whiteheads, pimples, oily skin, and sometimes scarring, mainly on the face, chest, and back. Genetics account for 80% of cases, while hormones and the bacterium Cutibacterium acnes also contribute. Diet, smoking, cleanliness, or sunlight have unclear effects.