There are few causes , which can result in dry , sticky lips.
It can be due to stress or may be related to nervousness or anxiety.
Also you should apply vaseline regularly .
Also , you could apply cold cream on your lips at night, before going to sleep.
These symptoms, can also be due to allergies, infections, drugs, and a number of medical problems. If symptoms persist for long time, then see your regular doctor for evaluation and management.
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Yes, disease related to ENT, can result in dry lips.
If you, have the symptoms for long time, and are not resolved with lotion, then doctor can prescribe a course of antibiotics.