Hi Dr. Andrew, I Had A Somewhat Dark Discoloration On

Hi Dr. Andrew,
I had a somewhat dark discoloration on my arm along (about 1 in an 1/2 with other pre-cancerous looking sun spots or liver spots. It must have been itching and I'm sure I scratched it (not thinking) as I was reading a book. When I looked at it, I realized it had bled, and as the blood dried, it turned a black color or bluish-black; a color I had never seen before on me from a scab, which always appeared kind of rusty, but nothing so intensely black.
thanks for answering; I'm waiting here at the computer.
David Lucier,
Santa Cruz, CA