Bumps on my Bassett

My 4 year old Bassett has bumps/lumps on his body. They’re mostly on his sides. We’ve taken him to the vet for this multiple times – he’s gotten a steroid shot, special shampoo, etc and they always seem to come back. The vet has said he just has oily Bassett skin.

Recently he’s developed one on his upper eyelid and on the top of his head. They don’t seem to be bothering him but I’m wondering if this is something I should be worried about? Has anyone’s Bassett had something similar?

For reference he eats purina pro plan salmon and rice.