If this was testicular cancer I would expect it to be on the testes rather than the scrotal sac. Perhaps it is a benign cyst or infected follicle. If it doesn't resolve on its own, you should see a doctor. I am doubtful this is anything of an emergent nature so you should be able to wait a little while before seeing the doctor unless you get an increase of pain, signs of infection such as swelling, redness, fever, etc. .
The answers in online forums are for information only and are not intended to substitute for medical advice and care. Please see your personal health care provider for further evaluation of your individual case.
Debbie Miller, RN