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Caused by human papilloma virus (HPV), anal warts, also known as condyloma, are growths affecting the skin around the anus, in the anal canal or in the lower rectum. Sexual contact is usually how you would get anal warts. Anal warts may affect the male (penis or scrotum) or female (vagina or labia) genitals. Having anal warts can cause discomfort, irritation, bleeding, itchiness and difficulty in bowel movements. Choosing the proper treatment depends on the location, number and size of the warts.