I have itchy white spots on my scrotum , how would i get rid and prevent them ?

Pruritis: Could be several things. Commonly fungus ( jock itch) would be helped by diaper cream. Also possible allergy based so Benadryl (diphenhydramine) could alleviate the itching. Other causes, such as neuropathic itching from spinal nerve impingement requires examination. Either way if if doesn't get better or worsens, have an exam to fully elucidate the diagnosis, then treatment will be more specific.