this is 斑秃 (alopecia areata), most likely due to

来源: HenryLi 于 2009-08-19 14:12:50 [] [博客] [旧帖] [给我悄悄话] 本文已被阅读： 0 次 (102 bytes)
stress (just like 茶mm said: 可能是精神紧张等原因).

It will eventually grow back in most cases.
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