Butch has got terrible raised angry looking red welts on the back of his neck and in between his shoulder blades with patchy hair loss.We have had him at two different vets and they have carried out various tests but all to no avail.It was thought that this may be an infection of sorts and as such he has had two lots of anti biotics.These have not worked either. We have tried Carmosa ointment this also hasnt worked.This is now spreading and looking considerably angrier.My wife has returned to the vets today for a third time.Can you help or advise?