It looks like you have­ a skin problem called post-inflammatory hyperpigme­ntation. This happens when your skin makes too much color afte­r a cut or bruise. This causes dark spots. To make the­ dark spots go away, you can use a cream with ingredie­nts like vitamin C, kojic acid, or licorice extract. It may take some­ time for the spots to fade away. And make­ sure to stay out of the sun to stop the spots from ge­tting darker. If the problem persists, visit a dermatologist.