I have a small pea-sized, possibly smaller, lump at the base of my penis in the top of the scrotum. I first noticed it two days ago. It hasn't caused me any pain, unless I aggravate it, by touching or squeezing it. Today, I feel a little sensitive in the right side of my groin right where the leg and pelvis come together. It is a little red around the area of the lump. It doesn't seem to be getting any bigger or smaller but has me concerned. What should I do?