The answer lies in lips' unique anatomy ... that demarcates lip tissue from the rest of the face — the tissue resembles the mucous membrane that lines the inside of the mouth.

“Cracked lip corners from dryness or weather ... a touch of filler can lift the corners of the mouth instantaneously, changing the local anatomy of the corners of the mouth, which may prevent ...

Severely chapped lips are more often noted on the body of the lip.” AC is relatively ... exaggerated skin creases around the mouth, because of aging or anatomy, might be more likely to get ...