Many differences: The syphilitic ulcer has a hard base which is non-tender, has a well-defined edge and will, with time, disappear on its own. The chancroid ulcer has a soft base, is quite tender and may look inflamed, and has ragged shaggy edges. You should not try to make this diagnosis yourself, but see a doctor, because if you have one std the odds are good that you have more than one. Get tested.
Answered 9/28/2016
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