Q My granny is 80 years healthy, from 3 to 4 months she has developed itching only at night times on randoms parts of her body with out any rashes or marks, itching will be on her back, thighs and her lower abdomen, she is healthy with out Bp, diabetes or any other disease.
Non specific, random itching could be due to dryness of skin. You can apply moisturizer or oil on her skin every morning immediately after bathing to prevent it. Does she get itching only after going to bed? In that case, you may have to check her mattress, bed sheets, blanket etc; since she could be reacting to any of these fabrics.