My husband has this on his arm. The mole (darker part) has always been there, but he can't remember whether the other bit (now reddish) was there as a lighter mark or something else before. It certainly hasn't always looked like this. I'm really worried that it's something horrible but don't want to scare him as we're on holiday at the moment and can't get to a doctor until Monday. The skin is quite dry so it's hard to tell what the texture is like. It's about 1cm long altogether. Please can any of you shed any light on this?