Help i found a lump

Patient: Hey,As i was just getting ready for bed i noticed a little pain as i pulled my trousers on. So i checked and there is like a little ball thing under the skin behind my scrotum that when is squeezed or pressure is applied to it there is a little pain. It is on the right behind my scrotum. i am a little worried as to what it is and didnt know who to ask as i dont know much about anatomy etc as im only 16. i hope you can help.Many thanksBen

Symptoms: lump