Pronounced: AK-neeEn Español (Spanish Version)
Acne occurs when the pores of the skin become clogged, inflamed, and sometimes infected. These clogged pores can result in blackheads, whiteheads, pustules, or cysts. Acne is common in teenagers, but can also occur in adults.
Acne starts in the skin's sebaceous glands. These glands secrete an oily substance called sebum. The sebum normally travels through a tiny hair follicle from the gland to the skin's surface. Sometimes the sebum becomes trapped and mixes with dead skin cells and bacteria. This causes clogged pores called comedones.
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Blackheads are comedones that reach the skin's surface. Whiteheads are comedones that stay beneath the surface of the skin. Small red bumps, pimples, and cysts may also develop.
The main causes of acne include:
- Changes in levels of male hormones called androgens
- Increased sebum production
- Changes inside the hair follicle
Last reviewedDecember 2014by Michael Woods, MD
Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.