Hi. Greetings. You could be having chelitis. This could occur due to several causes including intake of certain medicines,
vitamin deficiencies, constant lipping or biting of lips or allergy to any lip balm. You could use a lip balm which contains a sunscreen or even simple Vaseline jelly is fine. You could come for a consultation of you are from Bangalore or See a dermatologist in your city to discuss if any tests and the maintenance treatment you need. Hope this helps.