How to get rid of discoloration?

It was a pimple scab but I pulled it off -_- its not entirely sunken in but it is a tiny bit indented. Anything that can help????? I need it to heal as soon as possible. I'm not even sure if its an atrophic scar but I did cut off the healing process by pulling the scab off... so I'm not even sure what it is. But it is discolored and missing the top layer of skin. Please help? 10 pts for the best answer! Thanks.