Rash?

Bree

So my baby boy is a 9 month old American bully/ staffy terrier cross. We were having some issues with a food allergy but have finally sorted it all out and his rash and other issues cleared right up. However, I recently noticed his testicles are looking strange. Very dry skin, and some red and irritated bumps. We have an appointment to get him neutered in 3 months when he turns 1 but I need to know if I should try and make another appointment prior to that for the vet to take a look at this. It doesn't seem to be bothering him too much but I really dont like the looks of this. Ive never had a male dog before so this is pretty new to me. Does anyone have any ideas as to what this could be and/or what I could do to help it? Picture of the problem, and one of my handsome boys face ❤