About two weeks ago my 11 month old lab broke out with two little white spots on his trunk and his chin had what looked like acne. Everyone said he was probably allergic to something, I changed his food to an all natural diet. I changed his bowls I changed laundry detergent and nothing worked. It has now spread all over his face and he scratches it until it bleeds. Now he is limping I am so scared!! He has an appointment with the vet tomorrow morning. If anyone has any idea what this could be I would appreciate it.