你即將離開本站
What is acne? Acne is a disorder of the hair follicles and oil glands (sebaceous glands). The sebaceous glands secrete oils (sebum) to keep the skin moist. When the glands get clogged, it can lead to pimples and cysts.
Acne is very common. People of all races and ages have acne. In fact, most people in the U.S. between 11 and 30 years old will be affected by it. Even people in their 40s and 50s can have acne. However, acne most often begins in puberty. During puberty, the male sex hormones (androgens) increase in both boys and girls. This causes the sebaceous glands to make more oil.
Normally, the sebum produced travels through the hair follicles to the skin. However, skin cells can plug the follicles. This can block the sebum. When follicles become plugged, skin bacteria begin to grow inside the follicles. Inflammation and pimples then develop. The most common types of pimples are: Whiteheads (closed comedones): These pimples are sealed over and have a small white pus filled top. Blackheads 更多資訊 What causes acne? Rising hormone levels during puberty may cause acne. Also, acne is often inherited. Other causes of acne may include the following: Hormone level changes during a woman's menstrual cycle Hormone changes during pregnancy Starting or stopping birth control pills Certain medicines (such as corticosteroids, lithium, and barbiturates) Oil and grease from the scalp, mineral or cooking oil, and certain cosmetics Diet may also play a role Squeezing the pimples or scrubbing the skin too hard can make acne worse. Skin may also become irritated with friction or pressure from helmets, backpacks, or tight collars. Pollution or humidity can also irritate the skin.
