The difference between filiform warts and flat warts is mainly manifested in the cause, symptoms, treatment and other aspects. 1. cause: flat warts is due to the body infected with human papillomavirus type 3, type 5, usually occur in young people; filiform warts is due to the infection of human papillomavirus type 1, type 4, type 7 and so on, often occur in the immunity of the crowd. 2. Symptoms: flat warts occur on the hands and face of patients, manifested as a clear border, the color of normal skin color or light brown flat papules, varying in size, smooth surface; filiform warts are mostly alone, for the soft filamentous organisms, the color of the grey-brown, occurring in the neck, eyelids, armpits and other places. 3. Treatment: flat warts can be removed by applying retinoic acid cream or liquid nitrogen freezing, laser, etc. Filiform warts can be removed by applying 5-fluorouracil ointment or liquid nitrogen freezing, surgical excision and other methods. If you are diagnosed with filiform warts or flat warts, it is recommended that you go to the hospital for early treatment. If you need to use medication, you should pay attention to use under the guidance of the doctor, do not blindly take medication, to prevent the occurrence of adverse symptoms.