Unbearable itching after bath. Shape.

Hi There, After taking bath, there is an unbearable itching/burning of skin which lasts for atleast 30 minutes. Or suddenly in the midnight, skin starts itching suddenly. Itching gets severe during rains or cool climate. Itching is all over the body except face. Tried some creams and tablets prescribed by few doctors but no use. I work infront laptop all the day. I'm confined in a small room. It's been an year since I started facing this problem. I hardly exposed to Sun from the last one year. Not sure if this is the cause. Need permanent solution please. In the initial days, there was no redness or rashes. But from the past few months, there are some 4-5 very small bumps(pimples kind of) appearing in round shape.