I have beesn dealing with the same thing for a few months...I am 59 and this is still new...it finally reached most all of my body, was going two days with out sleep...calamine lotion, baking soda baths, Epsom salts baths nothing would work for very long...daughter thought Maybe it was scarlet fever...went to a doc in the box ...gave me a 3 day burst of prednisone and some topical cream....went away...my doc said I had adrenal fatigue. possible fungus or parasite...may have breathed in some mold from the barn???caffeine, acidic foods seem to bring it on agaiin...something related to cortisol? I also had swelling in the legs and feet but the rash was a killer seems its trying to come back...
These can be due to hives. Hives (medically known as urticaria) are red, itchy, raised areas of skin that appear in varying shapes and sizes. They have a tendency to change size rapidly and to move around, disappearing in one place and reappearing in other places, often in a matter of hours.
Many cases of hives are "idiopathic," meaning no cause is known. Others may be triggered by viral infections or medications.
I sincerely hope that helps. Take care and please do keep me posted on how you are doing.