3 doctors weighed in:

How do I differentiate between syphillis chancre and chancroid?

3 doctors weighed in
Dr. Martin Raff
Internal Medicine - Infectious Disease
2 doctors agree

In brief: 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.

In brief: 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.
Dr. Martin Raff
Dr. Martin Raff
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