Acne is a common skin condition that affects many people, particularly teenagers and young adults. It is characterized by the presence of pimples, blackheads, and whiteheads on the face, neck, chest, and back. The exact cause of acne is not known, but it is thought to be related to hormonal changes, genetics, and the buildup of oil and bacteria on the skin, acne can be caused by a combination of factors, including excess oil production, clogged pores, and the presence of certain types of bacteria, such as Propionibacterium acnes.