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Infection vs. immune: A chancre is an ulceration that is one of the stages of having the std syphilis. A canker sore or apthous ulcer is caused by an immune reaction or trauma. The chancre needs treatment via antibiotics to be cured and the canker sore is self limiting and heals on its own but does recur. ...Read moreSee 2 more doctor answers
Syphilis: Chancres or ulcerations can be seen with different infections but most commonly with primary syphilis. this chancre will clear if not treated but will lead to secondary and possibly tertiary syphilis which infects the brain. Any ulcer on the penis should be seen by a dermatologist or urologist. If treated with antibiotics, the infection is cleared. But in cases of untreated syphilis a recurrence ...Read more
Stage of disease: A chancre is the initial lesion at the point where the syphilis bacterium first entered the body. Usually it's a painless ulcer that feels hard. Syphilis is the disease caused by infection with the bacterium t pallidum; it's still around and is serious. Chancroid by contrast is a different disease, more uncomfortable but far less serious. ...Read more
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