The testicles should feel smooth without any lumps or bumps and firm but not hard. You may feel a soft tube at the back of each testicle, which is called the epididymis.
It’s important for men to examine their testicles regularly, about once a month, for any lumps or swellings. Knowing what’s normal for you will help you to notice any changes.
Most lumps in the testicles are harmless. However, in rare cases, a lump can be a sign of testicular cancer. Testicular cancer is most common in younger men and can be successfully treated if diagnosed early.
The best time to examine your testicles is after a warm bath or shower, when the scrotum is relaxed. Hold your scrotum in the palm of your hand and use your fingers and thumb to gently feel each testicle.
If you feel any lumps or swellings in either testicle, or notice any changes in the shape or size of your testicles,see your doctor he will examin and know the cause and prescribe the treatment
however you can still know through other symptoms this is a brief of what you should know
-There are several causes of testicular lumps and swellings:
-varicocele: caused by enlarged veins in the testicles (may look like a bag of worms)
-hydrocele: a swelling caused by fluid around the testicle
-epididymal cyst: a lump caused by a collection of fluid in the epididymis
-testicular torsion: a sudden painful swelling that occurs when a testicle becomes twisted (this is a medical emergency and requires surgery as soon as possible)
-testicular cancer: an estimated four in 100 lumps are cancer, so this is an uncommon cause of lumps
-epididymitis: a chlamydia infection in the epididymis can cause inflammation, swelling and tenderness inside the scrotum (ball sack). A few men will notice that the whole of the scrotum is red and tender