I have a tiger oscar that is about 10inches in size and he just started developing this bump,looks almost like a little mini pencil eraser on his lower chin. I have tried researching it,but no luck. Any ideas? take into mind that this tiger oscar out of my three is the craziest. Always knocking this over and stuff.

if you take a look at the oscar fish in the upper left corner of the page,
you can see the lump under the lower lip. if you are referring to like that,
it is normal.

Hi there,
Check this link

www.oscarfishlover.com/lump-on-oscars-chin

This is a common question and if it is in the middle of the bottom lip its perfectly normal. Can you post a pic so we can be sure please

completely normal ........i have seen more oscars with these lumps than without ...

i have one with a lump and three without