I know Having severely reduced circulation that I need to take great care of my feet. Even told by the Vascular Consultant that the slightest small blister meant getting in touch and staying off that foot until healed. Somehow I felt he was being a bit severe and putting the wind up me. Anyway I was ultra careful with my feet. So when I noticed Id somehow managed to get a tiny minor surface scratch on the top of my foot, I cleaned it all and thought no more of it. Only for it to slowly get bigger and red around the edges and then form a sort of large crust, as if I'd had a real injury. Thought oh it's started to heal at last as it's dry, albeit a bit red around the edges, but not painful and I've got oversensitiv not lack of in my feet. Wrong on all counts. So now 5 weeks later, it's still not healed? Still red around the edges , now painful and a bit swollen and being treated and checked weekly by the nurse coming out. Was a bit scary when she mentioned it was eating it's way down the levels of skin, as there isn't enough blood to heal it so the tissue starts to break down around and deeper. Even more so when she said it might never heal, so now have to start wearing a special waterproof boot when in the bath or shower to keep it dry. In a week or 2 if still dry and not any worse, looking at some sort of debridement or something. So moral of the story is, even a silly little scratch can develop into something troublesome , and wear socks at all times to protect your feet from minor surface scratches.