If you find you itch after a shower, particularly if you take a shower before going to bed, and particularly if its your shins that itch – change your soap. I discovered that most soaps contain sodium in them (e.g. salt) of various forms; sodium palmate, sodium tallowate, sodium cocoate… Next time you buy soap, look for a soap without ‘sodium x’.
Hint: if it is proving difficult to find a soap without sodium, even amongst the expensive, organic and ‘healthy’ soaps, search predominantly amongst goat’s milk. It’s about the only place I have found soaps without salt.
If you fancy having a go at making your own; Little House Living offers clear instructions on making your own soap.