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What is the most common type of syphilis?
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The most common type of syphilis is called primary syphilis. It is a bacterial infection that causes painless sores on the genitals, anus, and mouth. These sores are called chancres. The bacteria can spread to other parts of the body, including the heart, bones, brain, and skin. If left untreated, it can cause serious health problems, such as blindness, deafness, and stroke.