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Our 4 month old has a bulge on the side of it's mouth.The bugle isn't very big,but is noticable.We have 8 other sliders and have never experienced this before.He swims,eats fine.Is in a 20 gal.by himself.his growth is on par.Other than this,everything is fine with him.Any suggestions?Any ideals as to what this could be?Thanks in advance.

Sounds like an abcess, which would need treatment by a vet.. Can you post a pic?

Sounds like what my little RES just had. She had an ear abscess from and inner ear infection. It'll need to go to the vet like mine did, have it lanced, cleaned, and put on antibiotics.