Trichomoniasis is caused by a protozoan called Trichomonas vaginalis. Most guys have no symptoms at all, but some may have pain with urination. Guys usually find out they have this infection when a female sexual partner finds out that she is infected. It is treated with an antibiotic. Pubic lice can infect the pubic area and cause intense itching as well as a red rash.
Treatment is with a medicated shampoo or rinse.
If you are sexually active, the best way to decrease your chances of getting an STD is to use a condom during sex. However, using a condom might not completely protect you from getting STDs such as genital warts, herpes, molluscum and pubic lice, since these infections can involve areas of skin the condom doesn't cover. Dr. Jonathan Trager is a physician board certified in pediatrics and dermatology. He is a fellow at the Mount Sinai Medical Center in New York City and a staff member of the Mount Sinai Adolescent Health Center. This information is not intended to be a substitute for professional medical advice.