Very hard to know, or tell from the photo. We could make guesses, but i would recommend a vet visit so you know for sure. It may be nothing much, but if it is something more serious it would be best to have it taken care of as soon as possible. Do keep us updated, and best of luck to him that is is nothing serious
Update it ended up being a benign mass. However it ended up growing all over the inside of his ear and spread to his throat and he was unable to eat and had issues breathing and had to be put down last October. The vet offered only to amputate it around 2018 and parents declined. I don’t know if it would have helped but nothing we did helped so maybe we should’ve.