white on fish's lips

I just got a flame angel and noticed that he has a white spot on his lip. It actually protrudes away from his natural shape, al;most looks like a little blister, and his lips seem like they have some white on them too, any help with identification and treatment would be great, thatnks a lot. BTW, I hav a lot of inverts in the tank, so any non-copper treatment would help a lot.
Dustin <img src="graemlins//confused.gif" border="0" alt="[confused]" />
 
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