I've had this problem since my early teens (I'm now in my 40s), and for years it was horrible. Almost everytime after taking a shower I'd have an unbearable itch in my lower legs, to the point that I could do NOTHING until it went away, just felt like scratching and screaming for half an hour. Hardly a sustainable condition.I don't know the cause, but I figured out what always avoided the itch: immediately after getting out of the shower and drying myself, put my pants on. Having my legs covered after showering avoids the problem 100%. Once in a while I don't do it, and can start to feel the itch coming, but jumping into my pants stops it.For me it was a surprisingly simple fix, has made this condition, whatever it is, to have no impact in my life anymore. Hope this helps someone.