皮肤的硬结

例句：

1. 1. His skin has developed a hard knot on his neck.
   他的脖子上长了一个硬结。
2. 2. The doctor found a hard knot under the skin.
   医生发现皮下有一个硬结。
3. 3. The hard knot was removed by the surgeon.
   外科医生将这个硬结切除了。