I have white bumps in scrotum. No painful. No burning. The smaller I can pop easily and get out pus. The larger are very hard to pop no burning when urine?

Sebaceous cysts... What you nicely described most likely represent the common occurrence of hyperactive sebaceous glands and cysts, which at times may be infected like acne or abscess, and there is no cure but leave them alone or excise them at the time of no infection if becoming annoyed by recurrent infection. More? Go to articles listed in http://formefirst.com/onDealSickness.html. Best wish to health...