This is gonna sound weirtd, but bath him with Selsun Blue. It is not just for dandruff, but for flaky scalp and is very gentle. I used it on my old, and now passed, cat that had HORRID dry skin. That poor animal scratched so hard they became sores. The shampoo worked.
Tea tree oil rubbed into the skin after bathing too is very soothing, as someone else said.
Tea tree oil rubbed into the skin after bathing too is very soothing, as someone else said.