Flat warts may cause symptoms of itching. Flat warts are proliferative changes in the skin that occur after the invasion of the human papilloma virus. Patients will produce more obvious reddish-brown papules with a smooth surface, which may be accompanied by itching symptoms, but everyone’s physical condition is different, so the symptoms of flat warts manifest differently. The actual warts can be treated with imiquimod ointment, fluorouracil ointment and other medications under the direction of a doctor, but more often than not, they are treated with physical therapy, such as laser therapy, liquid nitrogen cryotherapy, etc. The most common treatment for warts is to use a laser or a liquid nitrogen cryotherapy.