Sun damage may make the lips, especially the lower lip, hard and dry. Red speckles or a white filmy look signal damage that increases the chance of subsequent cancer. This type of damage can be reduced by covering the lips with a lip balm containing sunscreen or by shielding the face from the sun's harmful rays with a wide-brimmed hat.
If the symptoms persist then get a dermatologist’s evaluation done.
Hope it helps. Take care and pls do keep me posted on how you are doing or if you have any additional queries.Kind regards.