Help! Largemouth Bass injury/disease!

[lix.ma14]

bass are sturdy fish, but delicate to meds... ide give it a few days and give it a chance to heal.. btw they are excessively aggressive fish ime, ive seen them take on some of the heavy weights of the cichlid world and win. and made the mistake of trying to keep a small group (3) once. its also possibly a small leach... their are native species that are tiny that go for the mouth area. they are fairly harmless unless the fish gets infested and waiting a week or two wont do damage.

doubt it's leaches sinch it's the same colour as mouth. Could it be a larger muscle at the jaw? the bump seems to be not visable when the bass opens wide. it doesn't seem to heal.

in what case would a tumor happen to a fish?