I've had similar itches whilst using the on-site facilities at several, but not all, Caravan Club sites and occasionally when using the shower in the 'van. I've tried reducing the water temperature, using different shower gel and applying aqueous cream after my shower but nothing really seems to be the cure. Is it something in the local water supplies that aren't in the water where I live near Derby and it's just my skin recognising that there is a difference ? One thing that I do know is that the itches are quite maddening for about half an hour after my shower. Perhaps there is a Doc out there who can throw some light on it for us.