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.
Warts are caused by human papillomavirus, or HPV, whereas genital herpes is caused by herpes simplex virus, or HSV. Warts are not a form of herpes, and HPV will not cause genital herpes. Conversely, genital herpes does not cause cervical cancer or anal cancer. There are more than 100 types of HPV. Different types are associated with infections in different areas of the body and different forms of persistent infection.