Use a comma to separate nonessential elements from a sentence. More specifically, when a sentence includes information that is not crucial to the message or intent of the sentence, enclose it in or separate it by commas.
Genital warts are a sexually transmitted infection (STI) caused by certain strains of the human papillomavirus (HPV). These skin growths can cause pain, discomfort, and itching. They are especially dangerous for women because some types of HPV can also cause cancer of the cervix and vulva.
A Honor Society of Nursing (STTI) answered. Genital warts are caused by the human papillomavirus (HPV), which usually enters the body during sexual contact. The virus commonly enters through the genitals, rectum, or mouth, and infects the skin's upper layer. Once in the skin, the virus causes small bumps or cauliflower-like growths that may itch or burn.