The blister skin is not broken, and it is useless to apply medicine. Try to protect the blister skin, and it will be even harder to get better if it breaks.

If the skin is broken, it is not suitable to apply medicine to the lips if you often talk and eat during the day. As long as it is often cleaned with a cotton swab of normal saline, it is enough to apply oily ointment to moisturize before going to bed at night.

Usually the skin is peeled off, and the surface meat inside is necrotic before it turns white.

Then there are serious burns on the surface of the skin. The affected area is white and dry. This is a serious burn. You must go to the hospital.