Flat warts are a skin disease caused by human papillomavirus infection, which many people have experienced. Patients with flat warts cannot eat many foods. Firstly, they should avoid irritant foods, such as seafood, including sea fish, shrimp, crabs, etc. Secondly, they should avoid spicy and stimulating foods, such as hot pots and barbecues, and they should not drink alcohol. Finally, patients with flat warts should pay attention to eating more foods rich in vitamins and proteins.