My 8 month old puppy has developed a skin rash on his underside hind legs (armpits I call it) and now little bit around his mouth. He has been on medication (cefpodoxime) but the rash keeps returning. His food is Nutro - Lamb/rice. All grain foods have been removed and no treats at all.Has any one experienced this problem, possibly have an answer. will this eventually go away. I am looking for possible solution/alternate treatment/reason for rash ?