Lichen planus occurs in adolescents and is caused by HPV-3 infection and is contagious on the face, back of the hands, and forearms. The lesions are pinpoint to rice-colored or pale brown flattened lesions that may be self-inoculated and arranged in a bead-like pattern after scratching. Generally, there are no conscious symptoms, but itching may occur in heavy cases. The course of the disease is slow, a small number of patients can be self-healing, but also recurring. At present, the treatment mostly adopts physical therapy, such as laser, electrocautery, freezing, etc., but the patient is more painful, the treatment cost is higher, after treatment, short-term can not bathing, inconvenient life, after the operation also leaves pigmentation or scars affect the beauty. There is no clear and effective topical drugs, there is no clear and effective anti-HPV oral drugs, can try immunomodulators such as transfer factor, levamisole, thymidine, etc., can also be injected with interferon to achieve better results, to the above methods are long course of treatment, the efficacy is not sure, not recognized by patients. The actual method: 1, with cuttlebone (also known as cuttlefish bone) light scraping skin lesions, so that the slight damage, 2, external application of Riyamei (a topical interferon, about 12 yuan) can also use peptide butylamine cream, light scraping + external use, not limited to the number of times, until the flat warts broken crust, fall off, most of the flat warts healed. 3, if the blood scab off found flat warts still not fall off, that cuttlebone scraping too light, the above steps The actual fact is that you will be able to do it once more until you are cured. This method is not limited to time, not limited to the number of times, does not affect the bath, do not leave pigmentation, lesions more patients with oral transfer factor or thymus peptide, as long as they adhere to will be cured.