Thanks for the query.
Dry lips are a common thing and may not be related to any particular disease.
Most often they are there due to weather changes.
In some cases medication like lipid lowering agents can also cause dry lips.
Just apply white petroleum jelly ( vaseline).
If it persists for more than a month ,
Please meet a dermatologist
for exact diagnosis.
Let me know if you have any other doubt.
you can ask a direct question to me on this forum, following the below link.
Wishing you a good health.