Acne is the most common skin disease that causes pimples. They form when hair follicles under your skin clog up. It is not just a problem for teenagers; it can affect anyone from the ages 10 to 40. There are a lot of misconceptions and myths about acne. There are several factors known to be linked to acne such as hereditary, hormonal changes which could be due to menstrual cycle and puberty, stress and through increased output of hormones from adrenal glands, hyperactive sebaceous glands.