Reef nutrition

fish with what looks like a zit on its lip

Was trying think on how to word this and that was the only way I could think of. I was looking at a few wrasses ( yeah I know ). Anyways 2 Scott's that I saw had what looked like a zit on its lip. 2 of them had the same mark but were very active and eating well. The other one had no mark on its lip , active but not eating yet. Does anyone have any idea what that might be ?
 
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