Are you kidding? At my age, if I got a Hickey, I'm drawing a red line around it with magic marker
You can treat it like a bruise, once you notice it, apply ice or something frozen to it and it should help it fade.
use a come to brush it out or as a girl would say " i burned my neck on my strightener"
Get them in a more discreet location and don't worry about them if you feel that you absolutely want one.
Gross. If you're under 16, don't worry, you look cool. 16+, you look like a loser who gets laid so rarely he needs to have proof of the event for the world to see.
hickeys are pretty much entirely avoidable.