以下是引用seven-11在2009-7-28 23:51:00的发言：

LZ,这个你一定要去皮肤科去看看。。。

有两种可能，一种是霉菌，就是灰指甲

一种可能就是痣，有癌变的可能，所以一定要去看皮肤科医生

以下是引用xyz1234在2009-7-28 23:01:00的发言：
 runner's toe? 一般都是穿的鞋子不合适造成的.

http://en.wikipedia.org/wiki/Runner%27s_toe

Runner's toe is a common condition seen in runners caused by downward pressure or horizontal separation of nail plate from the nail bed. This repetitive traumatic injury leads to bleeding and pooling of blood underneath the nail plate. Clinically, it is characterized by red black discoloration of the toe nail

以下是引用dudu@NY在2009-7-28 21:29:00的发言：
 somebody steps on your toe?

以下是引用xiaoxiao6231在2009-7-29 0:25:00的发言：

有很多种可能，你最好看一下医生