Would a dermatologist be able to help with a turned down smile? (photos)

Ever since I was a kid I've had a turn down smile. I was always asked if I was angry!(even though I wasn't ) I never noticed it until last year. I just entered my thirties and I've noticed my lips have disappeared. Would a dermatologist be able to fix it ? Or should I see a plastic surgeon? .. I've been trying to figure out who can help me ..

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