Sun burns and blisters, due to excessive exposure are equally harmful. Blisters on the lips are due to herpes simplex virus due to excessive exposure to sun. Blisters that are red in color with a raised area are also seen due to an allergic reaction to the sun. A blister that resembles a rash is filled with pus. Do you have the boils only on your lips? This kind of allergic reaction is also in response to detergents, harsh chemicals, lotions or soaps that react with the sun's rays. Boils are cleaned and taken care of, as they are contagious.
Vaseline is an effective remedy. Topical application of an antibacterial cream is helpful. Perspiration bubbles also result in blisters and are a result of perspiration that is trapped under the epidermis. A visit to a dermatologist or allergist is also useful. Consider taking your sun block creams to your physician, to get more insight on these creams. Exposure to sun is the only point of consideration, till the diagnosis of the problem. Prescription drugs, which are antibiotics, are effective against sun blisters. Have you checked a fresh gel of the aloe leaf? Wear a wide brimmed hart to prevent the sun from affecting your lips.
answered by Dr C