dimple
US /ˈdɪm.pəl/
UK /ˈdɪm.pəl/

1.
a small natural indentation or hollow in the flesh, especially in the cheek or chin.
:
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She smiled, revealing a cute dimple on her left cheek.
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He has a prominent dimple on his chin.
2.
a slight indentation in a surface.
:
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The golf ball had small dimples all over its surface.
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The impact left a slight dimple in the car door.