BEST HICKEY RESOLVER EVER
A hickey is just a bruise, meaning broken blood vessles that have clumped themselves together. Now, you can help the fact that they are broken, those have to fix themselves, BUT you can unclump them. This trick I learned when I was about 18.. so I still had a lot of akward moments in high school with using scarves, weird shaded cover-up, the whole nine yards..
Anyways.. when you first get it, use a warm (warm being the key word) compress.. The best way (to avoid having to use a soaking warm towel) is to run warm-hot water over a spoon.. Then place the spoon on the hickey.. this will help get the blood flowing around the broken blood vessels.. Right after that, take that spoon and put it in the freezer... (you'll need it for later)..
Next, take a regular comb, or one of those paddle brushes, and basically "comb" the hickey out.. run the brush/comb up and down, side to side along the surface of the skin.. A brush would be the best in this situation, cuz it has soft, tipped bristles.. Do this for a couple minutes.. it'll look funny, and you'll notice the spot getting red, but the redness will go away so fast.
Once youve done this over and over, take the spoon (thats in the freezer) and place it on the spot.. Now you want to use a cold compress to keep the blood vessels (that have now been spread out) in place.. Keep it on there until it gets warm from your skin temperature. The area might stay a little red for about 5 minutes... but the hickey should be rather un-noticable compared to when you first got it.