My older male rat max has a sore on his side from scratching so much.he's now missing a patch of fur and i dont know whut to do. I've been Putin kids polysporin on it and it not seeming to get better bcuz he keeps scratching. I dont know whut to do to help him. Hes my best buddy and i dont want to see him hurt. I'll post pics of his wound in my next msg.