Hi I accidentally fell asleep while my leg was on a heater because I was in a very cold room when I woke it ached really badly and I felt a lump and there was a red mark, which I didn't take any notice of but it has now been a few weeks since and I noticed a burn on the area that I didn't see and I didn't even know was there, there is absolutely no pain in it I can touch it no problem is that something to be worried about or will it just heal as normal? Just very strange as I've never had an injury that did not hurt in any way. Thanks for your time