Dealing with Painful Skin Sores

My Dr suggested slicing potatoe, warm in microwave, apply to lumps

You just described to a T what I’ve been living with for years! The something you pull out of it for me is like a tiny splinter in the middle of the sore. I have to keep allowing the sore to close up and peel off the top every day until the sore is at skin level. The skin becomes discolored and hardened and can take as long as a year to fully heal. It leaves behind a dark spot when its fully healed. I heats them

Have you been tested for lupus or any autoimmune disease?