The cause of cracked lips is dryness - either from the wind, which tightens and dries the skin and draws moisture from it, or from cold or heat, or due to a dry nature, as you have already learned. As for preventing this, before the lips are exposed to a similar cause, they are lubricated with wax ointments, fats, bone marrow or rose oil with lanolin; these substances sometimes also destroy existing cracks. Or films are glued onto the lips, for example, films of eggs or reeds, or the skins of garlic and onions.
As for eliminating the cracks that have formed, for this it is good to take calcined wine grounds and turpentine tree resin and mix with some kind of lard, for example, chicken or goose, or with honey, or take immature galls ground into dust, mixed with turpentine gum wood dissolved on fire. They say that lubricating the navel with oil before going to bed or placing a piece of cotton wool soaked in oil on the umbilical cavity is very useful for cracks in the navel.