My finger had over flexed the other day and now its swollen and a black spot under it its not bruise

it might be locked in place what it sounds like is trigger finger thats where the finger hurts to have it manualy moved could be somthing with circulation as well does it hurt to try and bend it you might have injuried it somehow if it doesn't get better try ice to see if that helps advil motrin you might try antinflamitory