Love-bite
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A Love-bite or hickey is a temporary mark or bruise on one's skin (medically, a minor hematoma) resulting from kissing or sucking or biting forcefully enough to burst blood vessels beneath the skin. It could also be called a 'tramp stamp' or a 'slag tag.'
Love bites last, depending on the person, from 4-12 days. Violinists and violists can easily receive a similar-looking mark on their neck from the pressure of the chin rest while practicing and are often mistaken for having a love bite.
Hickey is the most common slang term used to describe a "love bite", but "hickey" is also slang for a mark left on a male by the stain of a female's lipstick.