I have a 3 year old Beagle (Max) and it appears that he has some type of ringworm on one of his ears. On the inside flap of the ear it sometimes appear white and scaling while on the outside of the flap the hair seems to be thining or falling out in spots.

I have been bathing him with a fungicidal shampoo. Is there anything else or other products that I should be using to cure this problem??