i got him maybe 5 months ago, i havent noticed them until recently, although they couldve always been there, he's grown almost 5'' since i got him, maybe theyre just easier to see now, he doesnt act abnormal, im starting to guess that it could just possibly be irritation, ive seen my common pleco try to suck on him before, but he swam away pretty quickly, if thats the case i guess melafix?