What is wrong with Chace Crawford's (Nate's) lip on gossip girl?

There's something weird about his lip since the 5th season. Like in the middle of his upper lip. I wonder what is that? It looks weird. Did he have like a surgery or an accident or a lip implant ...or what? Cause it has been like that for pretty long time. You can see it... show more There's something weird about his lip since the 5th season. Like in the middle of his upper lip.
I wonder what is that? It looks weird.
Did he have like a surgery or an accident or a lip implant
...or what? Cause it has been like that for pretty long time.
You can see it here:
http://www3.pictures.zimbio.com/zp/Chace+Crawford+Gossip+Girl+Season+5+Episode+ojMmpq1NJJzl.jpg
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