<human>: Could you distill the essence of the text into 1-3 sentences?

So, first some background info. A few weeks ago I noticed a strange bruise-like mark on the bottom of my heel. I had just started running barefoot about once per week, but prior to that I wasn't really paying attention to the soles of my feet, so I really can't say if it happened before or after the barefoot running. But of course when I tell that to other people they say obviously I bruised my heel or got some kind of fungus or something. However, it doesn't hurt or itch at all and it's a little raised, making me think it's a mole I never noticed before. The shape is very asymmetrical and the color is uneven purple/black/brown. If you type in foot melanoma on google images (DON'T DO IT, it's pretty gross) there are many pictures that look just like what I have. So I made a doctor's appointment already for the 18th to get it checked out, but now I just want to cancel it because I have 2 races coming up and I don't want a doctor scraping stuff out of my foot with a scalpel in an important part of my training.
<bot>: 1. Anyone had a biopsy done on the sole of their foot? What did the doctor do exactly and how long did it take to heal? How soon could you run again?