Nothing like that is going to happen in a week. Just see a dermatologist, not a regular family physician. A dermatologist will be able to help you best. First you said it's black, then you said it's pretty light. Not sure what that means, but chances are you'll probably be fine, especially at 16. I've had a dark, irregular shaped mole on my chest removed, also. It was just a regular mole, in the end.