Talk to Dermatologist on Lip Skin Peeling Off

My lower lip continuously peels. First, a crust forms, and then a thick layer of skin peels off, either on its own or when I remove it. This happens every other day. I consulted a dermatologist who prescribed an antifungal cream and Hydrex emollient, but my condition has not improved despite using them. I am 24 years old, and this problem has been ongoing for the past 8 years. I do not know what is causing it. Please advise me what treatment options may help. I do not have any known systemic disease.