how do u know if u have testicular cancer? i was checking and i felt a little bumb, it feels like a pimple/zit. its not very big. could it be cancerous. im only 15, i dont want to die
its not on my ballsack, its on one of my testicles, so i cant see what it looks like

Probably an in-grown hair. But, if you are very worried ask your parents.

Go show your mom and see what she says.