A few days ago I was taking a shower and felt a bump on the back of my upper thigh (close to my buttocks). It was blue/black circular raised bump(like a pimple). Of course, I picked at it and it did bleed. A day later there was just a scab with a little red irritation around it. I picked off the scab and put neosporin on it. Now it is just a white circle with a litte bit of the red irritation still around it (which was there after I picked it the first time) The blue/black is gone. However, when I touch it, I seem to feel a knot under the area that I picked. Could this of been a result of the irritation? Could this be skin cancer? If it was skin cancer, would the blue/black area of disappeared like it did after I picked it. My plan was to watch it for a week. It seems to be healing with the ointment. If it does not heal, then I was going to consult my derm.