Will leave a red mark but probably just his hair. Likely to fuck up and come across him while drunk. Can try and make him disappear with more alcohol but will be back for kick ons.
A bruise caused by sucking/biting of the neck, chest, etc. The easiest way to get it off is to use a hairbrush, people! I've never had a hickey, but my sister has and the hairbrush works, trust me. It will look red for a little while, but when the redness is gone, NO HICKEY. Hope this helps. ;)