I've attached a photo but I'm not sure if its clear!
Its on his bottom jaw right at the front, it looks a bit fleshy!
I don't think its bothering him as such as he is eating okay, but his not keen on having it touched.
I'm not sure whether to take him to the vets, we're going on monday evening for another urine sample so ideally I'd rather wait till then but I just don't know.