I have a lump on my sack close to my penis it's not inside of the sack it on the outside and it hurts when touched?

Testis. Please send a photo of the lesion for proper diagnosis .
Infection? Because it's tender it may be an infection. Perhaps a small abscess or infected sebaceous cyst. Best to see your physician. Depending on his or her finding you may need just an antibiotic or a small incision to drain any infection.