Hello, I recently saw three hard, pimple like bumps on my scrotum. They are spread out, they aren't located in one certain spot. The is no pain, and the "pimples" do not itch. They are about 1 mm in size, and barely raised. I haven't had any sexual contact in over a year which was protected and the last time unprotected over 2 years ago. I am really confused as to what it is and would really appreciate advice. 

Thank you very much.