I repeat--you have nothing to be concerned about. Maybe it was a small mole to begin with, but you can't scratch off a melanoma to the extent that you seem to have done. I also don't know what you think a blood test could tell you, even theoretically. I don't know for sure what it was, but it seems most unlikely that a biopsy would even be worth considering. Please get hold of yourself, leave the spot alone, and keep your appointment as soon as you can get one, so you can get the reassurance you need and move on.
Take care.
Dr. Rockoff
Or carrots and brussels sprouts.
Dr. Rockoff
I don't know what it was but I can assure you that you would not mistake herpes for a mole. The 2 are like apples and oranges.