Mast cell disease is what my dr came up with after years of research. The persistent miserable whole body itch is triggered by who knows, often with face swelling double with the horrid itch. Steroids would calm it down but I’ve been given too much as it is so nothing now. Antihystemines four times daily, to 16 each day just to stay sane. Love working in yard however guarantee that my legs although covered doubly, will break into huge welts along with itch. Is this anything like yours? So very happy your lymphoma disappeared. May your cancer never return.