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脸上长了青春痘怎么办？有些人的第一反应是挤爆它。这样做会有什么不良后果吗？怎么处理痘痘才对皮肤最好？如何避免长痘？这些问题的答案都在这里啦。 How pimples form 痘痘是怎么形成的 Acne is one of the most common inflammatory skin conditions in adolescents. More than 80 percent of teenagers battle with pimples. It can also occur later in life for a number of reasons, including an imbalance of hormones called androgens. 痘痘是青少年最常见的一种皮肤炎症。超过80%的青少年都被痘痘困扰。人在成年后也会长痘痘，原因是多方面的，包括体内雄激素分泌失调。 At the moment, we need more research to fully understand the causes of acne. Oil glands (sebaceous glands), located in the skin at the base of the hair follicle, excrete oil (sebum) to lubricate the surface of the skin and hair. All parts of the body contain sebaceous glands, except the palms and soles of the feet. 眼下，我们需要更多研究来充分理解痘痘的成因。皮肤毛囊底部的皮脂腺分泌出油脂来润滑皮肤和头发表面。身体的所有部位都分布有皮脂腺，手掌和脚底除外。 Acne was previously thought to come from lack of normal shedding of the skin cells that line the sebaceous (oil gland) follicle. This was thought to lead to thickened skin and the formation of small comedones (black and white heads). | 
