They certainly can. Lip fillers are hyaluronic acid based products added to the lips to add volume and hydration. Hyaluronic acid draws in moisture and can hold many times its molecular weight in water.
I normally suggest lip balm and lip ointments for patients who have dry lips from isotretinoin, but skin booster like treatments for the lips can help add hydration as well. If you have thin lips and would like to add some volume or shape to your dry lips, then going with a lip filler would be a great 2-in-1 solution for your problem!
Hope this helps!
