Check for a valve, or enlarged vein
Also, if you are suspicious of possible infection, DRINKING WATER will help get the infection out. If you think a possible bacteria has traveled into your "ducts" then masturbate carefully. This will help to clear out and discharge any infections. Do this while drinking lots of water, atioxidents etc.
These things have all helped me in managing this pain. However, i notice flare ups after ejaculation.