Frequently the cause of this is a cyst in the scrotum, which is harmless. However, it is important to check it out with a doctor because it might be something serious.
Go to a doctor ASAP. It could very likely be cancer which is very treatable if caught early. DO NOT WAIT!
could be an infection in sperm sac
If it is large and swelled looking then it could be a varicocele
Testicle pain could be something as simple as a bruise, or it could be something potentially dangerous like a torsioned testicle that occurs when the testicle wraps and tangles the various ducts and vessels it is connected to inside the sac.
While having one testicle that is larger than the other could signal a hernia, it might also be nothing at all. Many males find that their testicles are not exactly the same, with one being larger than the other or one hanging lower than the other.
As long as blood is pumping through the testicle then it should have a pulse, the left testicle should have a pulse too.
Any bump or knot on the testicle need to be looked at by a doctor. Could be nothing, could be cancer. Go to the doctor, ASAP.
Testicle pain can be a symptom of an injury or blow to this area of the body. It also could indicate twisting of the testicles, an infection, swollen veins in the scrotum, or a cyst.
fuses are there to protect the wiring putting in a larger fuse is potentially dangerous could cause a fire
It's not necessarily bad, but you should see a doctor. You could possibly have a cyst or something else that could be a danger to your health or cause infertility. Don't be afraid of the doctor, it could be important and they're only there to help.
A Testicle should NEVER swell! If either of yours is swelling, see a Doctor immediately!! It could be Testicular Cancer which can kill you!!
According to the Mayo Clinic, testicle pain could be a result of a hernia, kidney stones, injury, blood vessel inflammation, urinary tract infection, or a variety of other causes. http://www.mayoclinic.com/health/testicle-pain/MY00464/DSECTION=causes
Most often a bump on a testicle is a cyst, called a varicocoele, which is harmless. However it could be more serious and its important to have a doctor check it out.