Canker sores and oral cancer lesions may seem similar but there are ways to tell the difference. A lesion that's red, typically flat, and painful early on is usually a canker sore (aphthous ulcer).

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In 8 out of 10 cases HIV is transmitted during sex between a man and a woman or between two men. The virus is passed on when infected blood, semen, or vaginal fluids from one partner enters the ...