To help bruise heal you should put some ice or ice gel on the bruise as soon as possible and keep it on for 15 minutes. Repeat after 10 minutes once again. This will stop the swelling and pain of affected area. After that cold compress treatment, apply Arnica cream or Arnica gel 3 to 4 times a day. Arnica has healing properties to reduce inflammation and help to relieve pain.
If the bruise is in the uncovered part of the body and you have some very important event to attend, you can always try to cover it up with foundation and corrector. Treat it like you would treat any other discoloration on your face. It can help instantly like a quick fix, but it is not going to heal your bruise. For healing process you try to use Arnica.
WARNING: Do not apply on a broken skin. For any series injury seek medical help!