not cancer. but if you get a lot of thme in the same place over and over again, you can do some daage to the local blood vessels. Hickeys are bruises, and bruises are broken blood vessels. Blood vessels are pretty resilient and heal up, but breaking them too often is bad for them.
got a hickey? ice it to reduce the swelling. treat it like any other bruise. and maybe you might wanna find some other way to have fun other than bruising each others' necks.
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