Allergies like blisters are all over the body which we were told was due to allergy with insuline injection. Diprosalic cream was applied and same disappeared temporarily which reappeared now with open sores and is not healing now more than 3 months. We are now applying Candid B but still not cicatrised. We are now on Forgica and metgormine denk 1000 for treatment of Diabetes. The colour of the skin has akso darkened with rashes over the body. Should we do a blood test. Please advise. Thk you