Q: What causes face dimples?
A: A face dimple is essentially a genetically transmitted abnormality of a muscle in the cheek. The bifid or double zygomaticus major muscle is tethered to the cheek, causing a deeper and more visible indentation when a person flexes it by smiling. Chin dimples are the result of the chin not fusing correctly during embryologic development, leaving a cleft.
Most babies have temporary cheek dimples due to an overabundance of fat in their cheeks. The dimples disappear as the baby fat melts away.
"Am I dying or is this my birthday?"
--Lady Nancy Astor (1879-1964), upon briefly awakening to find her family surrounding her bed
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