Forum members sent some interesting links when I asked about ringworm. I am thinking now it is rain rot, since the skin is not pink. I am still treating it with the iodine shampoo and antifungal cream every day. I will take him to the vet tomorrow to make sure it isn't anything contagious, as he is due at the children's petting exhibit on Friday.
Tried to get a close up picture. The black dots are hair tufts. Thanks to all who gave advice.
Tried to get a close up picture. The black dots are hair tufts. Thanks to all who gave advice.