For a while (many months, maybe even a year or so) I have had several small "lumps" on my scrotum. The largest is about .7mm in diameter, and hurts when pinching from the sides, but not otherwise. There are quite many of them, but except for the large one and a few others, most are very small, and I don't even know if those are the same thing. Seen from above, they are yellowish in the middle.

How do I get rid of them?