Does red mark or black mark left by pimple fade? Its been there for awhile already, a few months I guess? 1 to 3month. Help hehe thks

Inflammation/pigment. If the pimple just healed, this is likely some residual inflammation. If it's been a while, you may have some post inflammatory hyper pigmentation. It may resolve on it's own, but if its been there for a while you might try a bleaching cream or steroid ointment on it.