Acne is a common skin condition that affects millions of people worldwide. It occurs when hair follicles become clogged with excess oil (sebum), dead skin cells, and bacteria, leading to the formation of pimples, blackheads, whiteheads, and in severe cases, cystic acne. Acne most commonly appears on the face, chest, back, and shoulders, and it can affect people of all ages, especially teenagers and those with acne-prone skin.