Mine did the same until I realized I was licking my lips all day out of habit, which strips them constantly. Swapping to a thicker occlusive balm at night made the lines soften a lot within a couple weeks.
Check your toothpaste for sodium lauryl sulfate, it left my lips raw and flaky for years before I switched. Also worth looking at whether you are actually drinking enough water and running a humidifier in winter.
I keep an spf lip balm in every jacket pocket since sun exposure is what dries mine out and it is also my personal cold sore trigger. If it stays this bad after a few weeks of consistent care, it is worth getting a doctor to look at it rather than guessing.
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