The treatment ointment for flat warts include Vitamin A ointment, Fluorouracil ointment and Imiquimod cream. 1. Vitamin A ointment: Vitamin A ointment can regulate the cellular immune function or regulate the proliferation of epithelial cells to play a role in the treatment of flat warts, but it is not recommended to use a large area. Clinical retinoic acid ointment originally has certain side effects, can cause local skin reddening, itching, peeling and other side effects. Clinically sunburned skin, people allergic to vitamin A prohibit the use of this drug. Women of childbearing age, pregnant and lactating women are prohibited from using this drug. 2. Fluorouracil Ointment: Fluorouracil ointment is a kind of skin anti-infective drug, commonly used in the treatment of flat warts, condyloma acuminatum and other diseases. It may leave pigmentation on the local skin when used, and is generally not recommended for use on the face. When patients use fluorouracil ointment early, they may experience loss of appetite, vomiting, nausea, and stomatitis, diarrhea, etc. In severe cases, bloody diarrhea may occur. 3. imiquimod cream: can through the activation of immune cells to stimulate and improve the patient’s body to identify the role of the virus, for mild and moderate flat warts patients, the efficacy of the patient is better than the severe patients. The use of this product is generally prohibited for those who are allergic to the drug, pregnant women and lactating women.