The glands produce oil and are stimulated by male hormones produced by the adrenal glands both male and females.
At least 85 percent of people in the world experience acne between the ages of 12 to 24 year.
It affects 3 in every 4 people aged 11 to 30 years.
Risk factors include genetics, the menstrual cycle, anxiety, stress, hot and humid climates, using oil-based makeup, and squeezing pimples.