Facial “weakness”

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Okay so my son typically keeps his mouth pulled tight I guess kinda purses his lips a lot 😂 well when he makes face and “talks” ect the one side of his mouth seems to droop 🤷🏻‍♀️I don’t best way to describe it his lips on one side seem weaker. He’s been doing this about a month and a half I’ve noticed it anyways. My drs said we would discuss it at his appointment which is Friday but curious if any one else has dealt with this