Cut a potato in half and put it on it for at least 15 minutes. The starch helps it out apparently. Don't know how or why but it really does work.. my friend came home one night with BLACK hickies on the side of her neck and was freaking out cause she didn't want her dad to see, so my mom did this. Doesn't make them go away completely but makes them fade so they can easily be covered up!

Lots of concealer and stuff

Good luck!