I have rash on hands that burn, itch, and swell. Prednizone masked the symptoms for awhile but, now it is back. Sometimes, there are large welts on face neck and arms. In addition, I have a pain in my back ,inside right shoulder blade going up into my head, sometimes causing headaches. I don t think I could be allergic to anything as I have not eaten anything different or used any product that is different. I think it is nerve related and not dermatological. My internist is baffled! Help!