Squishy lump in scrotum?

I'm having a hard time figuring out what this is:

I was cleaning myself a few weeks ago, and I noticed a rather decent sized, for lack of a better word "squishy" mass posterior to my left testicle. I checked my right testicle to see if I had the same thing there, but I do not. I don't know what it is. As far as I can say, it isn't natural because I can't palpate it on my right testicle, only the left. I thought at first it may be an inguinal hernia? It is not a hard mass so I do not suspect it may be cancerous, it feels more like a bag of worms? I do not believe it to be the epididymis seeing as how it only affects the left side of my scrotum. I can see a difference when looking at my scrotum in the mirror, that the left side is malformed and obviously larger in comparison to my right. I've scheduled a PHA with my PCM in about a week, but does anyone have any idea what it may be to settle my nerves until then?

Thank you in advance.