I have a burning sensation at the space between my scrotum and anus (I think it is called the perineum?). It worsens when I sit down and sometimes, causes my penis to hurt a bit. Also, my left testicle aches every now and again and it seems to be veiny. When my testicle aches, I can feel a dull pain sensation along my left abdomen and stomach. I have gone for a thorough STD test and sperm culture etc and all is clear. What could this be?
Thanks for asking in Chat Doctor forum Dull aching chronic pain in testicles can be due to varicocele or hernia. As you are also giving history of many feeling of left testicle, it is most probably suggestive of varicocele.  So, please visit a surgeon for physical examination and investigation in this regard. All the best.