Why whole body itches constantly? Chest, stomach, arms, back and legs. I have redness or dry skin. The chest, arms and legs is what most itches.
There may be several causes. Mast cells are skin cells that contain histamine, are activated by some stimulus: food, soaps or detergents, body creams, or even anxiety, chronic liver and kidney disease, certain cancers and in cases of autoimmune reactions (for example: grafts). Consult your dermatologist.