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First, what is a hickey?
A hickey is caused by the application of pressure onto the skin, which leads to the rupture of blood vessels underneath the skin, causing a bruise,” Scottsdale, Arizona-based Jennifer Sawaya, MD, dermatologist and cosmetic and laser specialist with US Dermatology Partners, tells Health. The pressure on your skin came from your partner’s mouth…and the resulting hickey is basically a bruise.
Typically, a bruise anywhere on your body takes three to 14 days to disappear, says Dr. Sawaya. “This depends on a variety of factors, including the cause, depth, and size of bruising, as well as the individual,” she explains.
Source: Health – How to Get Rid of a Hickey—or At Least Cover It Up