I have an African Cichlid who's developed a large bump on the side of it's face, just under it's eye. He/she is almost 5 years old and has had this thing once before, only in a different spot. It went away then without any kind of treatment, but the bump that's there now doesn't seem to be getting any better. It looks like a zit that is primed for popping, and is now almost as big as his/her eye. He/she shares a tank with other fish that don't have any problems. Does anyone have any idea what this could be?