I use St. Ives Oatmeal & Shea Butter Body Wash often. It really helps me. St. Ives also has the body lotion to go along with the body wash. Some other products that can help and depending on the severity are posted in the picture below. Now, if it is really serious and over the counter products don't work then I would suggest seeing a dermatologist.
Look into new research on eczema. Doctors have found that staph germs in the air sometimes cause skin problems. If you soak your feet in a very mild bleach solution, 1 tablespoon in a gallon of water, for a few minutes a day, it might help the itching. If it does help. then you could try it on a washcloth for your back.
It depends on what is causing the itching. If your cause is the same as mine it's from dry skin on the back and mild callousing on the feet. For my back I gently rub with a loofah sponge when bathing. For the feet I use one of those small Dr Scholl sand paper type paddles once a week after soaking my feet. Oh, and right after you get out of the bath put your lotion on while skin is still damp.
If there is no reason for the itch, and you have seen a doctor it could be nerve endings. Aspercreme usually works if it is a small area but not over a large area. that could be dangerous.
A soak in a bath with oatmeal can ease itch quite well. I fill cheese cloth with oatmeal and let the bath water from the tap run through it while filling the tub. I've also found that mint added to lotion helps to ease itch.
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