my dog has broke out with what looks like ringworms on his stomache he has 5 of them....but i'm not sure if it's a grass allergy...i have used cort. creme on him and it has not helped....i do know if it is ringworms that they are very contagious... but i have no $ to take him to the vet so does anyone have any remedies for it....i know iodine kills them but not sure how long it takes and if it's safe for the dog....help me please