I had a friend at school who had really bad eczema - pretty much all over - and every night she used to have to cover herself in a cream which had a high percentage of urea. It wasn't the most pleasant smelling cream as I recall - we used to have to help her with her back so we got a good whiff!!
One of my grandfather's cures (he had an arsenal of folk cures) for chilblains was to soak your feet in urine. The actress Sarah Miles is an aficionado of drinking her own urine