[souffle]

That doesn't look right to me. They can get various problems down there including skin infections, tumours, orchiditis and many are treatable when caught early so I would have him seen by the vets as soon as you can. Good luck and let us know how he does.
Normal testicles can move up and down and stick out oddly sometimes like peanuts under the skin especially when they are warm but the rough area on his should not be there.