A classic sign of oral cancer is a persistent rough patch that looks like a sore and has a raised border. It can appear on the tongue, the tonsils, or the top of the mouth. Unlike some ulcers and ...
Compiled by The Learning Network CreditClockwise, from top left: Hannah Beier for The New York Times; Ashley Gilbertson for The New York Times; Alika Jenner/Getty Images; Perawongmetha/Reuters ...