I have never been itchy when withdrawing from amphetamines, but I do itch when I'm coming down after consuming a large amount of amphetamines. I can only describe it as a tactile hallucination that feels like something between an itch and like there's something on my skin causing the itch, which I try to brush off (even though I know there's nothing there). According to Wiki:
Tactile hallucinations are the illusion of tactile sensory input, simulating various types of pressure to the skin or other organs. One subtype of tactile hallucination, formication, is the sensation of insects crawling underneath the skin and is frequently associated with prolonged cocaine or amphetamine use or with withdrawal from alcohol or benzodiazepines.
Hey, at least I don't get formication!
