According to your description, it may be cold sores caused by herpes simplex virus type I infection. This is a self-limiting disease. If there is no infection and inflammation, it will heal itself in about 10- 15 days. However, because there is no specific anti-virus drug at present, it will recur when the human body's resistance drops. In order to control symptoms and reduce recurrence, acyclovir (chemical name: pentacyclic guanosine) tablets can be taken, which can inhibit virus replication and effectively control symptoms and infections. It is suggested that acyclovir can effectively control blisters and other symptoms when the burning sensation of the lips is not appropriate in the future.