Lip blisters

Most blister formation is a response to exogenous factors to skin irritation or other damage, although some may be the result of disease or other conditions. A single blister is usually caused by friction or mild burns, and is typically located on the hands, feet, or other exposed areas. A string of blisters could be the result of a severe burn, or a drug, chemical reaction, or autoimmune disease. According to the theory of traditional Chinese medicine, lip blisters are indeed evidence of fiery fever, or there is internal heat, or exogenous heat and evil, which causes heat to condense. It is steamed on the head and face or bet on the two Yins. "Heat sores" or "Fire scabies".