My right testis is bigger than left since i noticed for first time 6yrs back..i hadnot done intercourse till then..and sometimes there was discharge from urethra not yellow or whitish..i had done intercourse 2yrs ago with protection...then i got tested for hiv one year back..result is negative.i got sbig rash like on my penis between the year of intercourse and HIv testing and red lesions around my scrotum. Now recently i got tested for syphillis and reult was negative.now i had 2big rash with flat brown sport at centre and red at periphery..and my left knee joint also pain sometimes.and i got backache sometimes.do i have gonorhoea or any other sexual diseases.help me !!thanks in advance !!