Facial features are characteristics dictated by genetic inheritance .
Genetic abnormalities may predispose individuals to changes in features. The length of the philtrum, which is the midline groove in the upper lip that runs from the top of the lip to the nose, is determined genetically. In some syndromes this grove is shortened. There may be other causes of a short philtrum. This list is not all inclusive, and the causes are not presented in order of likelihood.