You can feel several structures such as epididymis, vas deferens, and veins.
When the veins are dilated and increase tortuousity it is known as a varicoele (and has a bag of worms appearance which gets worse when standing up). This is more commonly on the left side. If this is the case you should have your GP check it out as it can result in infertility as the increased blood flow in the veins increases the temperature in the local region to make it hostile to sperm production. Also rare causes for varicoeles need to be excluded such as left renal (kidney) masses which occlude the left testicular vein which drains to the renal system.
Kind Regards
R.
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vein behind testicle 
Linear Mode
