How common is it to get epididymitis from syphilis? I have been having off and on sensitivity for the last two months accompanied by tightness in pelvis, thigh, and groin. I have been tested for gono, chlam, and hiv, all negative. Also 4 days after last sexual exposure(june) i was given 1g zithro and 250 g ceftra. Was not tested for syphilis, never saw a chancre, and never noticed a rash- could this be a possibility?