A lice-killing lotion containing 1% permethrin or a mousse containing pyrethrins and piperonyl butoxide can be used to treat pubic (crab) lice. These products are available over-the-counter without a prescription at a local drug store or pharmacy. These medications are safe and effective when used exactly according to the instructions in the package or on the label. Lindane shampoo is a prescription medication that can kill lice and lice eggs.
Trichomoniasis is another type of vaginal infection. It is caused by a single-celled parasite that is usually spread through sex. In addition to causing bleeding after sex, it can also cause vaginal discharge and itching.
Intercourse-related factors that can cause vaginal irritation, itching, and burning include the use of cream and jelly spermicides or other vaginally inserted contraceptives, including the sponge. Bath soaps, deodorants, ointments, creams, lotions, and vaginal douches are other potential irritating culprits.