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.
Genital warts causes explained. Genital warts are always caused by HPV. There is no other known cause for warts appearing in the genital area at this time. Of all the strains of HPV, strains six and eleven are responsible for 90% of all genital wart infections.