a dimple
Examples
Many a man in love with a dimple makes the mistake of marrying the whole girl.
Many a man who falls in love with a dimple make the mistake of marrying the whole girl.
A dimple on the chin, the devil within.
A dimple in the chin, your living comes in; a dimple in the cheek, your living to seek.
A man in love mistakes a pimple for a dimple.
A man in love mistakes a harelip for a dimple.