DR M.A. ANSARY / SCIENCE PHOTO LIBRARY DR M.A. ANSARY / SCIENCE PHOTO LIBRARY
Syphilis. Primary chancre (ulcer) on the upper lip of a 17-year-old boy with syphilis. Syphilis is an infection by the Treponema pallidum bacterium. The first symptom is this ulcer at the infection site. This heals after a month or two, and the secondary stage starts up to a month after this. Secondary syphilis involves a rash, headaches, pain in the bones and fatigue. This eventually subsides, and the patient appears normal. The latent stage may last for years, even decades, but can progress to tertiary syphilis with tissue death, blood vessel disease and paralysis by brain damage. All stages are treated with penicillin antibiotic drugs. The patient became infected by performing oral sex.
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