But since you have it all over your body, it is difficult to say
what is causing it. In females menopause could be
a cause and hormone replacement therapy helps. Other than that it could be an allergic reaction to pollen, mold, dust, pet dander, synthetic fiber, food, cosmetics (powders, soaps, shampoos—see if anything was recently changed) or drugs. You must get an allergy test done, either a skin test or RAST, to know what you are allergic to.
Hope this helps.