The difference between flat warts and filiform warts is that the causes are different, the symptoms are different, and the treatment is different. 1. different causes: the development of flat warts and the body’s cellular immune dysfunction, is caused by HPV-3, 5 or 10 viral infection, resulting in epithelial cells abnormal differentiation and proliferation, filiform warts is caused by human papilloma virus infection of the skin mucosa. 2. different symptoms: flat warts are found on the face, back of the hands, forearms, neck and upper chest, the color is normal skin color, gray and light brown, the surface is smooth, the number varies; filiform warts of the lesion form for the fine tip of the wart-like cumbersome organisms, the number of indeterminate, usually no self-awareness of the symptom, repeated friction broken, there may be an infection. 3. different treatment: the treatment of flat warts commonly used drugs have 0.05% ~ 0.1% retinoic acid ointment, 5% imiquimod ointment, etc., but also through the liquid nitrogen freezing, microwave treatment, and other physical methods; the treatment of filiform warts, the commonly used drugs, including phthalidomide cream, fluorouracil ointment, and ping yang yin and so on. It is recommended that patients go to a regular hospital, under the diagnosis of the doctor, according to the patient’s condition, to take targeted treatment.