There are many reasons for blistering lips and also dryness, commonly due to viral infections, bad habits, allergies and so on. 1. Viral infection: Herpes simplex virus infection skin herpes can occur in any part of the body, such as the skin-mucous membrane junction lip edge, corners of the mouth and other places. At the beginning of the local skin itching, burning or tingling, and then congestion, redness, and then appeared pinhead or rice grain size clusters of blisters, can appear more clusters of blisters. Performance for the lips blistering dry. 2. Bad habits: drinking less water or consuming more spicy and stimulating foods such as chili peppers can also cause blistering and dry lips. 3. Allergy: If you are allergic to food, if the symptoms are severe after consumption, blistering and dry lips can also occur. There may be other reasons for the blistering and dryness of the lips, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease and standardize the treatment.