Primary Chancre
A primary chancre is a painless sore that appears at the site of infection with the bacterium Treponema pallidum, which causes syphilis. This sore typically develops about three weeks after exposure and is usually round, firm, and raised. It is often found on the genitals, anus, or mouth, depending on the route of transmission.
The primary chancre is the first stage of syphilis and is a key indicator of the disease. If left untreated, it can progress to secondary syphilis, which involves more widespread symptoms. Early detection and treatment with antibiotics, such as penicillin, are crucial for effective management.