It is immature and certainly unsightly, in this manner it is bad.
C'mon. Nobody is supposed to give hickeys, unless it's your intention to humiliate your friend. They might happen from time to time, but have sense enough not to embarrass each other. They're not a standard part of relationships-- they are incidental at best.
It's not bad but it sure isn't great. If that's the only thing you like then consider that you can get that from a guy you actually care for.
I would give her advice on to dump him and on how to dump him so he doesn't feel as hurt.
Give him a chance, if it doesn't work out just stay his friend.
Depends...
well it depends what you did if he is your friend and there is nothing going on with you two then there is nothing bad about laying with a guy in his bed when he is not your boyfriend :)
If your friend is really your friend she will respect your choices. Try show her that he isnt that bad, hopefully she comes around. If she doesnt, is the guy really more important than your friend to lose her over?
Leave him, confront him, or ignore him completely.
a flower of chocolates
yes it is my friend got a youtube account and she met this guy and the guy brainwashed her and did very very bad things to her.
he cares about you
You tell your friend "he does?" and if you like the guy in question, give him a sly smile and a wave. Be yourself and ask him out if he doesn't ask you! If you don't, ask your friend PRIVATELY for a few tips on letting the guy off easy. If this guy told your friend that he likes you, he trusts your friend.