Definitely see a doctor but I've experienced a similar issue before while taking five times the recommended dose of exemstane . My urologist determine that was a blockage from too much sperm being made so I literally had to jerk off every 3 hours not to be gross just being honest here just to keep the lump from returning mine was underneath my right testicle hurt like hell , similar to blue balls from high school watching the cheerleaders doing backbends or some ****