Lately I have had random itching spells, its usually my back, buttox, and arms. Only thing that helps is time, abt 20 minutes then im ok, no rashes?

Paresthesia. Paresthesia refers to a burning or prickling sensation that is usually felt in the hands, arms, legs, or feet, but can also occur in other parts of the body. The sensation, which happens without warning, is usually painless and described as tingling or numbness, skin crawling, or itching.Chronic paresthesia is often a symptom of an underlying neurological disease or traumatic nerve damage.