Flat warts are usually found on the face, neck, back of the hands, forearms, and upper chest, but can develop on other parts of the body as well. Flat warts are caused by human papillomavirus infection, which is a benign lesion, and can be manifested as flat papules, which can be normal skin color, light brown or brown; the surface is smooth and hard; the number of warts varies, and they can be sparsely distributed, or densely packed into groups; the patients usually do not have self-conscious symptoms, and they are of chronic morbidity. Flat warts are common in young people, immunity, skin trauma, common in the face, back of the hands, forearms, neck, upper chest and other parts of the patient’s other parts of the lesion will also appear. Flat warts are contagious and can be spread through close contact with other people’s skin, sharing personal belongings with the patient, etc. Scratching the lesions with your hands may lead to the spread of your own inoculation when they come into contact with other parts of your body. Flat warts can mostly disappear on their own after a few years, and can be removed by medication, surgery, physical therapy, etc. It is recommended that patients who have the need to remove them go to a regular hospital and choose the best treatment plan under the guidance of a doctor.