My 6yr old Schipperke blew his undercoat over a week and a half ago. After the shedding was complete, he developed itchy dry dandruff flakes that would come off when groomed. We brushed him alot during the big shed and after. Today I noticed tiny bumps here and there on his back from shoulders down to just before the tail area. Some bumps go down over the ribs. Some bumps are just felt and hard to see as they are just skin color but some a light pink. He scratches all the time which is not like him. I wondered if he had chiggers (we live in the woods) but his legs and belly do not have any tiny bumps at all. He does not have fleas. Is there something I can bath him in to sooth the itchy skin? Right now he is wearing a thin dog t-shirt to keep him from scratching as I do not want him to tear up his skin. He is otherwise in very good health with regular vet checkups. Any help will be gratefully appreciated, thank you!