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Dry air causes them. You should use a humidifier indoors. You should use lip balm which is high in emollients and contains petrolatum and dimethicone as the ingredients. Lip ointments are just as good a choice. To keep your lips protected, reapply frequently. You need about six to eight coats during the day, so apply first thing in the morning, last thing at night, and every couple of hours during the day. Wear a scarf or a ski mask that covers your mouth when you go out in the cold. Avoid licking your lips. Drink plenty of fluids. Avoid contact with irritants or allergens, such as fragrances or dyes, in cosmetics or skin care products. Breathe through your nose. Breathing through your mouth can cause your lips to dry out. Don’t peel or bite flaky skin. Don’t exfoliate.
Can you attach the photos here? How old are you? Are you male or female? How tall are you? How much do you weigh? Any weight change? When did it start? Is it consistent? Is it getting worse? Does anything make it worse or better? Pain or itch? Any other symptoms? Are you aware of anything which might have triggered it? Any medical problems? Any surgeries? Any other medications including over-the-counter pills and herbs? Any family medical history?
I suspect it may not be due to chapped lips because it is not improved with the remedies. That's why I asked you to attach the photos here. It could be due to allergies, vitamin deficiency, yeast infection, autoimmune diseases, or skin tumors. You should see a dermatologist to have a biopsy if necessary.