How to get rid of a hickey fast???!

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So basically I went on the bumper cars two days ago with my friends and the seatbelt whipped into my shoulder and now it looks like I have a hickey. I'm seeing my boyfriend tomorrow and I don't want him to think someone else gave me a hickey on my shoulder/neck so I need to know how to get rid of it fast???
Ps it's red because I tried to circulate the blood around