CDC / SCIENCE PHOTO LIBRARY CDC / SCIENCE PHOTO LIBRARY
Syphilis in the mouth. Close-up of the mouth of a patient with syphilis, showing signs of the onset of the secondary stage of the disease. These include generalised lymphadenopathy (abnormally-sized lymph nodes), and accompanying lingual (tongue) mucous patches. Syphilis is a sexually transmitted infection (STI) caused by the spirochete bacterium Treponema pallidum.
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