Vulva itch, how to judge is pubic lice or folliculitis

If pubic itching is caused by pubic lice, pubic lice can be found on pubic hair, but if it is caused by folliculitis, red maculopapules usually appear on the vulva skin. Pubic lice can generally be relieved after removing pubic hair, while folliculitis is inflammation of hair follicles and needs to be treated with erythromycin ointment.