"Hikkie's" are simply red marks where blood has rushed too, people give hikkie's by sucking on another individuals skin. Quite a peculiar question, but it deserves an answer.
First things it's spelt 'hickey' or a 'love bite'. A hickey or a love bite is a bruise or a mark that is caused for when a human is sucking or kissing the skin (usually the neck or arm, it varies).
Answer A hikkie (hickie or hicky) is a love bite, a bruise usually on this side of the neck, the product of kiss more like a suck, between passionate teenagers.
hickie, (if you mean love bite) can be removed by applying ice around it. Make sure u dont apply the ice on it, or else it will only grow. it is advisable to keep a spoon in your freezer and apply the spoon on the edges of the hickie.. It wi'll surely disappear in a few hours