To get rid of a hickey quickly, use ice or heat depending on how long you have had the hickey. It takes extended time for a hickey to dissipate, so be prepared to hide it with clothing or make-up.
A hickey is the result of blood seeping through burst capillaries under your skin. Lessen the impact of your hickey by applying ice within the first 48 hours; this prevents any more blood from adding to the appearance. After 48 hours, apply heat to encourage your body to reabsorb the blood cells causing the hickey. Be careful not to apply heat or ice directly to your skin, as this can cause further skin damage.