I recently noticed a small bump (eraser) size on the palm of my hand, the next day my hands had a few blisters as well as my feet. that was a few days ago. they're all over my hands, and my feet. i went to the dr. and they did a syphilis test and that was neg. He said as a precaution they would give me 2.4 penicillin in the rear. My question is .. With the meds being in my body for over 48 hours now, will by rashes start to diminish any time soon (they seem to be on my palms) , Had unprotected oral sex once about 4 to 5 weeks ago.