How dimples are formed?

Dimples are the result of shortened muscles (or deformities in the muscles) of the face. Debate remains open as to the genetic nature of dimples, with some scientists seeing a genetic basis and others not seeing evidence for this at all (J. H. McDonald, University of Delaware, accessed 2018). This uncertainty is bolstered by the fact that dimples may come and go during a person’s lifetime, suggesting other factors are also at play.