i recently (months) noticed a small hard bump on the shaft. its under the skin, and i can only notice it when i bend far to the other side. it doesn't hurt, and its not an STD. just wondering what it could be. the thing is, i have no idea when i first noticed this, and it i could've had it for even longer without knowing. i suppose it could be a thicker part of a vein or something, as there are some veins that i can see the imprint of when erect. its most likely nothing, but i was just wondering if it could potentially be a problem.