"Many men have frontal hairline recession only. Others will have thinning in the vertex (crown) of the scalp. Many times, both happen at the same time," says Dr. Amy McMichael with the Wake Forest Department of Dermatology in an email interview. "The order is predicted by genetics and each person has slightly different genetics that determine when hair will begin to thin and how severe hair loss will be."
维克福斯特皮肤科医生艾米•麦克迈克尔在接受邮件采访时表示:“许多男性只出现了发际线升高的问题。也有男性是头顶脱发。但大多数时候,这两者是同时发生的。脱发顺序是由基因决定的,每个人的基因都有些微不同,因此开始脱发的时间和脱发严重程度也不一样。”
The rest of the hair on the head is made of hardier stuff, apparently. The reason why men do not lose hair in the posterior scalp is that these follicles are genetically programmed to be stem cells and do not shed. This is why hair transplants harvest the hair from the back of the scalp.
头部其他地方的头发似乎更加强健。男性头部后方之所以不会脱发,是因为基因决定这里的毛囊由干细胞组成,并不会脱发。也正因如此,植发时移植的是后脑部位的头发。
Scientists are using this knowledge to develop more effective treatments to slow or stop hair loss. Currently, only two treatments are approved by the U.S. Food & Drug Administration. Minoxidil (brand name Rogaine) is applied topically, directly to the scalp to stimulate hair follicles. It has shown some success at slowing hair loss, even helping to re-grow hair. The other option is Finasteride (Propecia), which is taken orally to limit the production of the disruptive androgen DHT, which slows hair loss and promotes hair growth.
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