Why the red spot on girl's collar?

Well, I pointed out a female friend of mine that she have a red spot on the side of her neck. Then she say "ha, I bet a lot of society here don't even know what that means!" and she have a boyfriend and all. Now, adjectives I know is that probably her boyfriend was kissing her in that, but I don't understand: why the red spot? What cause the red spot to be there? Kissing doesn't grounds red rashes close to that... at least from what I've experienced. Any more info I should know almost this?
Answers:

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it's call a hickey you get it when someone (or you) sucks on a piece of your skin.

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its wen close to her bf probably kissed her there for so long tht it not here left a speck called a hickey and its cause by a partners sucking kiss !!

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YEAH I WOULD SAY ITS A HICKEY, THERE NICE TO GET IF YOUR INTO THAT SORT OF THING!

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its called a hickey... its from someone sucking on her skin too rock-hard bringing blood into the upper surface and causing brusing.

This is thoughtful of embarrasing to talk more or less, but I need help(girls only)?

Its a Hickey, and it happen when they suck too hard, and blood rises to the surface, bruising it, departure the red rash you saw.PLease pick me as best answer I call for some points!

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its call a hickey and u get it when a guy kisses/ sucks on ur collar..it just irritates ur skin. suck on ur arm for a while and u'll see how it happen..normal though...it go away

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itz call a hickey and its when a guy sucks on yr neck really not easy for a long time. all the blood go there and stays near 4 a few days. if u want u can try it by sucking on yr arm but thats just abnormal so..