Yes, you should brush the injured region with a dime or any other coin to disperse the blood that has accumulated. Similar outcomes are obtained by brushing the hickey or stroking it.
Simply pull the skin taut and scrape the region in an outward motion with the edge of the penny to remove a hickey. The area should be iced beforehand because the procedure may be uncomfortable. Alternately, vigorously massage the hickey or brush it with a toothbrush to spread the blood beneath the skin and significantly lessen its appearance.