When I was a child, we had a small device about 2" long which had a spring loaded blade about 1/4" long. You cocked the spring and when released, the blade would have punctured the skin about 1/8" deep.
My father said it was for cupping. I presume it belonged to my grandparents who were Scandinavian immigrants.
Hickeys can lead to further activity that results in pregnancy, and that has been known to cause blood clots, as well as other life-threatening consequences. (For most of history, it was the leading cause of death for adult women.)