I found a quarter sized blood blister near the base of my shaft in the center of my scrotem. Its not near the surface. All i've seen on here is angioKeratomis which is a bunch of little ones. It's not that. Also its not conected to my testicular cord it's a soft painless sack of blood that just popped up today. Will it go away on it's own. Should i drain it with a needle or see a doctor.