Your little guy may still be teething - as long as the teeth are still erupting it can cause some discomfort that can cause scratching behavior around the face/head.
Also, check his ears for any wax build-up. Use a cotton ball (NEVER a q-tip!) to gently wipe in his ears. If there is a large amount of wax, or dry wax chunks are found, he should be rechecked and diagnosed by your vet for a possible ear infection or mite infestation.