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.
Males should take the following steps to help avoid genital itching: 1  Wash the penis well, including the area under the foreskin in uncircumcised men. 2  Keep the area dry, since moisture in the genital area can lead to infections. 3  Cornstarch powders during the summer may be helpful.