It may have been heated or something very hot was placed on it that melted/moved the area in question. Note how the field curls upward in front of the face?
There is a movement in Numismadia to switch from PMD to PSD. Post strike damage is a much clearer term than post mint. Often something happens to a coin after the strike, yet before it leaves the mint. PMD can be confusing. SilverStackerKid composed a very nice editorial on it recently. I recommend reading it.
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