Replying to Hickey

so last night our school had the last football game of the year and i drank a few brews before as always with some buddies at a tailgate. after i proceeded to drink a few more. i thought it would be a great idea to go see my ex girlfriend who we had recently gotten back on good terms with. anyways we just hung out and shot the shit, and made out for a bit. all of a sudden i realized that she had been sucking on my neck for awhile. i asked her if she had given me a hickey and she was like yea, so i freaked out and left. anyways now im stuck with this huge hickey on my neck and i have a date tomorrow night with this cute girl that i just met the other day. how do i get rid of this shit!?