Flat warts and filiform warts are both infectious diseases caused by human papillomavirus infection, and their distinction can be made through the cause, symptoms and other aspects. 1. The cause: flat warts are mainly caused by human papillomavirus type 3, type 5 infection, preferred in young people, often in the resistance to low after the occurrence; filiform warts are mainly caused by type 1, type 2, type 4 and other infections, preferred in the immune system of the crowd, such as AIDS, organ transplantation patients. 2. Symptoms: flat warts and filiform warts are generally no conscious symptoms, flat warts lesions occur in the face, hands, etc., now for the size of the flat papules, smooth surface, hard texture, and lesions denser; filiform warts in the eyelids, neck, jaw, etc., for a single soft filamentous protruding superfluous organisms, the number of indeterminate. In addition, flat warts and filiform warts treatment is basically the same, medication, such as vitamin A cream, but also through freezing, carbon dioxide laser. In short, the above manifestation of the person, you should go to the hospital in time, under the guidance of the doctor for treatment, to avoid scratching the warts lead to infection, do not self-medication.