Blistered and swollen lips may be caused by the body being infected by herpes simplex virus. In this case, you can take antiviral medications, such as antiviral oral solution, Banlangen granules, Ganciclovir, etc. You can apply acyclovir ointment for local antiviral treatment on the blistered part of the lips. If the lips are suddenly blistered and red, with tight and tingling lips, it may also be due to angioneurotic edema caused by lip allergy, which can lead to rapid swelling of the lips. If the allergy exists only in the lip area, most of them do not require special treatment, but it is important to get rid of the suspected allergen as soon as possible, and the patient can be told to drink more water. If red rashes and wind clusters also appear on other parts of the body, desensitizing medication, such as desensitizing with paracetamol, can be taken appropriately. Blistered and swollen lips may also be caused by chronic lip inflammation due to vitamin B and vitamin C deficiency in the body, which can then be treated with vitamin supplements.