Brief Answer:
Unfortunately, this is cancer until proven otherwise.

Detailed Answer:
Hi there,

Is the mass attached to one of the testicles? Do it move when you move the testicle? Is there any discharge from the mass? Is it itchy or has it been itchy? It is red? How big is the mass? When did you first notice the mass?

Unfortunately, most cancers are usually painless masses, and therefore, this should be proven not to be cancer before anything else. Testicular cancer accounts for a small percentage of all cancers and men, and generally happens in men less than 35 years old. There is a very prognosis with testicular cancer.

A painless testicular mass is testicular cancer until proven otherwise. The masses are usually firm, hard, and fixed to a certain part of the testicle. Usually there will be some swollen lymph nodes also in the groin area.

I would highly recommend seeing your primary care doctor to get a full set of cancer markers, as well as a testicular ultrasound. You may need to see a specialist to get a biopsy if this is suspicious for testicular cancer.

If this is not cancer, and it is an abscess or similar lesion such as an ingrown hair, your primary care doctor can also treat that with some local excision and drainage.

I hope this helps. Let me know if you have additional questions.

---