My left testicle started to feel soar yesterday. It was either yesterday or the day before that I remember as I was changing I noticed pain after taking my shorts off. I was sort of in a hurry and removed the shorts without unbuckling my belt. I'm not sure if that was the culprit or not, but when I took a shower earlier today I noticed that my blood vessels had been enlarged and a fluid-filled sac. I experienced some pain while touching and examining it. While in a relaxed state the pain subdues, unless further provoked.

So I did a little online reasearch and discovered:

varicocele: this doesn't seem to be the case because it is said that it doesn't cause any amount of pain, although in a worse case scenerio pain is presentable.

Hydrocele, which is most common in children, sounds possible because it discusses a sac-like fluid buildup.

I looked around at hernia and torsional strain, but at this point, i'm not exactly sure.

I will make a doctors appointment after discussing with parents, the fun part.