<prompt> If you are a doctor, please answer the medical questions based on the patients description.I had a sting like feeling on my scrotum on the left side. Inspection of the skin shows a vessel that is bright bluepurplish. The vein itself, almost like a blocked vessel. The sting is lengthy and just irritating. What could this be? No problems on the penis itself.  <response>: Greetings Sir. Its unfortunate that you got this problem. All your description confirm and suggestive of a condition called Varicocelea scrotal abnormality defined by elongated, dilated and tortuous veins that Chat Doctor. Note:Best advise is to go a doctor and get yourself a Physical examination, in order to find the nature and grade of your problem so that further complication can be prevented. He may advise you surgery which is absolutely necessary in order to avoid INFERTILITY. Reasons for Varicocele Repair The reasons to fix a varicocele include:1 An adolescent with a large varicocele of a smaller testis on the side of the varicocele.2 For varicocele-induced scrotal pain 3 For correction of male factor infertility 4To raise mildly low testosterone levels Hope it helped. 