4 months ago
The marginal mandibular nerve and the depressor labii muscles are responsible for movement of the lower lip. One of these may have been injured during your scar revision surgery. It's possible that the nerve is simply bruised in which case it's just a matter of time until the function returns, sometimes up to a year. In the meantime, you can consider adding a drop of Botox on the opposite side to weaken that muscle and improve asymmetry during the healing process.
Web reference: http://www.la-plastic-surgery.com
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