So, for the past 18months or so I've been noticing a red/brown, spidery / blotchy rash on my inner thighs which has been getting worse. It's also on my lower back - though not as bad. Having now surfed the internet, it turns out that this is an actual medical condition caused by use of hot water bottles ( and exposure to other types of heat) and that it can get worse and in, I am hoping rare cases, can result in skin cancer. I did a search on here and found out that there have been a couple of discussions already about this (Erythema ab igne). It seems as though the safest thing is to stop using hot water bottles - it's pointless using them at a tepid heat as it won't help me. I already use a tens machine, take 5 different painkillers etc. My hot water bottles were a crucial part of a daily routine. I wake up every morning in bad pain and my partner always brings up a hot water bottle or sometimes two with a cup of tea! I use them through the day at times too - and God knows what the hell I will do next time I have a period! I've always used quite thick bottle covers to protect my skin but obviously that is not good enough. Why didn't I know about this - I feel as if I should have. Am I just a bit dim? Has anyone ever had this diagnosed by a doctor?