Hi jonstan. I have something similar to what you describe, not an itch, more of a tickle that I have to scratch. Went to my GP last year, but couldn' t throw any light on it. It went away, but it's come back this summer. It does feel like nerve endings irritating my skin. It feels like a feather is touching my skin, fleetingly. Keeps me awake at night. I was asked the usual questions. Change of bath stuff, washing powder, fabric conditioner. If the itching is really bad, I would suggest bicarbonate of soda mixed with water, splash it on. It's really soothing. See your GP as suggested. Good luck.