Nerve Issue After Lipo of Chin and Neck/Jaw Line

Weakness of the marginal mandibular branch of the facial nerve is well described after facial liposuction.  It was once much more common due to the size of the cannula that was used.  As cannula size has come down, the incidence of this injury has fallen off.  You are extremely early from you liposuction.  The nerve can be mildly traumatized and this can lead to a weakness on the side of the injury.  Over the course of many more weeks, it is not uncommon to see these completely resolve.  However, it is also possible that not all of the function will recover.  I would definitely bring this to your surgeon's attention so they can worry about the problem with you.

Although unusual, injuries to the
marginal mandibular nerve can occasionally occur during liposuction of the neck.  This nerve supplies the muscles that
move the corner of the mouth.  When
injured these muscles don’t function properly and this results in a distorted
smile.

During the procedure a liposuction
canula is repeatedly passed through the subcutaneous tissue.  This canula has the potential to damage
the marginal mandibuler nerve.  In
the majority of cases, the  nerve
is stretched or bruised, but rarely it can be transected. In most cases nerve
function returns with the passage of time, but loss of function may be permanent
when the nerve is transected.

In the majority of cases the nerve
is located above the jawline.  In a
small number of patients the nerve lies below the border of the mandible.  Under these circumstances the nerves
may be more vulnerable to injury during neck liposuction.

When this type of problem occurs
following liposuction, consultation with your plastic surgeon is
important.  It’s also important to
understand that the vast majority of injuries to the marginal mandibular nerve
resolve without treatment.

See a Board Certified Plastic Surgeon and be evaluated for nerve function.  Also, swelling can cause some impairment of the nerve for several weeks, but nerve damage is a possibility as well.  Thus, you need an evaluation with a Board Certified Plastic Surgeon who can offer alternatives.

It is not unusual to observe some weakness of the muscles controlled by the marginal mandibular nerve after submental liposuction (liposuction under the chin).  It usually occurs on one side resulting in an asymmetrical (lopsided) smile.  The good news is that is is almost always temporary.  It can take from a few weeks to a few months to get better.  Botox can be used to even out your smile while you wait for the nerve to heal, but I would give it 4-6 weeks to see if the nerve will heal quickly. 

Most likely, you have weakness of the muscle that pulls down the lower lip &/or the muscle that pulls down the angle of the mouth. This is usually the result of trauma to the nerve supplying the muscles. It usually resolves within a few weeks. Permanent damage of the nerve can be another possibility, albeit very rare. I agree with my colleague who suggested a little botox on the opposite side to correct the asymmetry. I personally would advise waiting for 4-6 weeks to give healing a chance.