Due to the effects of gravity, venous (deoxygenated) blood often pools down in the legs leading to chronic stasis change and consequently pruritus (itching). However any skin problem can also manifest itself on the legs. Unless I am able to see a photo, it is difficult to be absolutely sure that there is not other underlying skin problem. If it is simple stasis, then using a compression stocking and regular emollients will help. Topical steroids might also be necessary.
Dr. Sasi Attili