Hello! You seem to be suffering from exfoliative cheilitis. The reasons for this can be many such as constant lip licking, application of some lip balms which may cause an allergic phenomenon,photosensitivity etc. It may be due to some
vitamin deficiencies or due to dry weather too. At times the reason may be not known.
Add adequate water , seasonal fruits , salads in your diet.
I am not sure for how long you have taken zevit etc. You require some time to respond to those.