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.
Hemorrhoids aren't the only cause of itching in the anal area. Poor anal hygiene, perianal warts, intestinal worms, medication allergies, psoriasis, other forms of dermatitis or local infection, or even too much coffee can cause itching. Pain can result from fissures -- small cracks in the skin around the anus.