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.
If you've noticed uncomfortable itching in your genital region, you may have crabs (pubic lice). Crabs are usually sexually transmitted, with the risk of infestation from sexual skin to skin contact at more than 90%. They also spread through contact with clothing, towels and bed linens used by an infected person.