Difficult to say without evaluation.
A scrotal swelling can be due to a mass, cyst, varicocele or hydrocele. If it is superficial, infection or folliculitis can also be considered.
The test to do would be a scrotal ultrasound. This would give a more definitive evaluation of the lump, and rule out potentially serious causes.
I would consider a urology evaluation.
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Kevin, M.D.
kevinmd_