Hi, I noticed yesterday a dark (painful) scab on my elbow , I haven t bumped or cut it, it just appeared, it is about the size of a penny piece. That itself isn t the problem, the fact in exactly the same place on the other elblow, it seems the same thing is happening, although it is not as yet a scab, just a dark mark, press it and it hurts.. this is about the size of a small pea. I m 43 and worried about cancer!