I have a bump behind wisdom teeth, what could it be? (Photo)

My wisdom teeth are coming out, and behind my wisdom teeth on my upper jaw there are two hard lumps (one on each side). The one on my right is bigger, more swollen and more painful. I don't know if this is normal and if it is, what is it? I've had it for a few years. Picture attached isn't my teeth but showing the spots where the bumps are. I didn't know where else to ask.