the blood test turned out negative, but my doctor insist that it is syphilis and gave me 10 days medications with
azithromycin. around 4/8, the ulcer did not go away and the local lymp node start swelling. The ulcer and swelling continued even after i finished my azithromycin treatment, so I went back to the clinic and a second doctor asked me to perform another blood test for syphilis and turned out positive (RPR1:8, TPPA1:80), so I started the penecillin (240U/wk) treatment for 3 weeks.