Hello. Thanks for writing to us at healthcaremagic The difficulty in retracting prepuce could either be because of candid posthitis , in which there is inflammation and swelling of prepuce; the etiology is candidal Or it could also be because of traumatic tear with secondary bacterial infection . A single dose of an Oral antifungal is usually curative for candidal posthitis. I would suggest that you visit a specialist for a confirmatory diagnosis. The risk for a man who has unprotected vaginal intercourse with an HIV-positive woman is estimated to be 0.04% per sexual act. In other words, an average of one transmission is expected to occur for every 2500 instances of exposure. You may take a screening test for HIV, initially at 1 month after sexual activity and repeat testing at 3 months. Regards