My scrotum has been itchy occasionally. So I would scratch it. I work out a lot & sweat heavily in that area - so I thought no big deal. Finally took the time one morning to look down there & found 5 small, "blood blisters." About the size of a small pimple. They appear to be right on the surface. Only on the left side. No problem except for itching occasionally. Any ideas on what it is & how to treat safely??