Interferon can be delayed by a day occasionally, but frequent delays are not recommended. Interferon is commonly used in injectable and topical forms for the treatment of malignant tumors, viral skin diseases such as warts, and inflammatory skin diseases such as leukoaraiosis. Generally, when patients are unable to use interferon treatment on time due to special factors, it is possible to delay the use of interferon for a day, which usually does not affect the therapeutic effect. However, it is not recommended that patients using interferon to treat their diseases regularly delay or not use the drug on time, so as not to have an impact on the treatment and recovery of the disease. When using interferon to treat diseases, it is recommended that patients strictly follow the doctor’s instructions, and if abnormalities occur after using the drug, it is recommended that they consult a doctor in time.