about 2 months ago i found a small bump, the size of airsoft BB. it was only visible when i had an erection. No pain, discomfort, irritation, nothing. And recently it got larger, only a little but ive gotten worried. still no pain or anything. but it is visible and felt when i dont have an erection. located right where my penis shaft and scrotum meet. it is hard, and moveable. PLEASE HELPPP!!!!!!