skin soars (vet thinks is food allergies)

Question
I have been taking my dog to his vet every week or every two weeks since December and he keeps giving him antiobiotics and although his skin cleared up, as soon as we stop the medications (3 or 4 days later) the allergy starts again and usually worse than before.  He is on a special diet and on a special shampoo and yet I had to take him to the emergency room today because he was running a fever and the rash is coming back although he is on the medication.  His soars start out looking like really small red or pink dots then from one day to the next they get filled with puss and about three days from the day they appear (if not less time) they pop and turn into soars.  Right now his paws are swallon and red to the point that he was limping.  His vet had me soak his paws in betadine and now the emergency vet gave me a blue liquid to soak them in and a c collar to keep him from licking them or biting them.  She also refered me to the dermatology but the appointment is not for 3 months so I am really worried and I was wondering if there is anything else I can do for him since he is looking very sad and doesn't want to do anything but sleep (not eat or drink unless I kind of convince him to by putting it next to him and having him taste it and he still doesn't want to eat he will only drink)Although the ER's vet told me he had a fever she didn't give him anything for it.  Is there anything besides aspirin that I can give him such as children's tylenol....I am really worried about him and don't know what to do...Does this sound like a food allergy to you or could it be anything else?....thanks for your help

Answer
Some dogs require constant antibiotic therapy.  There are many diseases of the skin including food allergy that can cause these sores.  It is sometimes difficult to figure out without a food elimination diet, skin biopsies, or allergy testing.  Tylenol is toxic to dogs.