hi, i think i got the exact came thing it. i got the lump an i kept without seeing a doctor for a week tht it became unbareable to walk.
mine was an abcess and from unprotected sex. it was so painful. i got in 3 times in a period of 3 months.
its really bad.
you better take care and also go see a doctor, the pus and bacteria could be contagious and thus you would need to go for a cluture to check on wht bacteria you need to kill.
take care