I had this sore on my obdonmenal since June, at first it was red, it hurt to touch. Now it is november and it is black and very itchy, it is under my skin, you can see it. it has some little tiny dotes sores around it and it is scally, like dry skin.
See your doctor. With the changes to this "sore" that you describe it could be a form of skin cancer.
You NEED to get it looked at. Don't delay any longer!