There are a number of testicular health problems that can cause a tender lump or swelling within the scrotum. These include varicoceles (essentially, varicose veins around the testicle), hydroceles (a sac of fluid around the testicle), epididymitis, torsion of the testicular appendage, speramtocele (cyst of the testicle), and inguinal (groin) hernias. Torsion (or twisting) of the testicle can also occur, although this is generally associated with very severe pain, and eventual death of the testicle if the torsion is not relieved.
Finally, masses within the testicle must always be evaluated to rule-out testicular cancer. While most testicular tumors are relatively painless, discomfort can occur with larger tumors.
Unfortunately, it is not possible to make a specific diagnosis over the internet. Hopefully, you can find the means to see a physican (and, ideally, a Urologist) to examine your testicles. Most likely, an ultrasound of the scrotum will also be required to further assess this mass.
Sincerely/ Robert A. Wascher, MD, FACS
http://doctorwascher.com
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