I accidentally rubbed off a very small, round brown mole that had appeared on my knee about a year ago. I was looking at it closely because I was trying to remember the shade of brown it was when I first noticed it as compared to a year later. The skin just kind of rubbed off and now it has healed over with no sign of pigmentation. If it was an early melanoma will it continue to grow under the skin to the point where it could spread without there being evidence on the surface of the skin?
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