I’m a 35 year old male. 22 years ago I had surgery to remove my left testicle. I am currently experiencing pain in my scrotum on the left side. There is a small bulge that is tender to touch. It becomes more noticeable and more tender when erect. Pain radiates up into my groin area. Was very painful at the beginning of the week and has gotten better, but still some pain there. Any idea what this could be?