Can anything can be done about fullness of lower face and underbite? (Photo)

 Fullness of lower face and treatment?  I would need to see you in person since the treatment varies widely. It depends on age and exactly what is causing the fullness etc. Otherwise I would just be guessing. 

Botox and/or radiofrequency can be used to slim and contour the jawline.  Sometimes jaw surgery, liposuction or ThermiRF can also help contour the face. I recommend getting a formal evaluation with a cosmetic dermatologist. Best, Dr. Emer

It would be much easier to discuss which therapies would benefit your face specifically if you added some photos of your face, especially frontal and profile views. Certainly, we should be clear that Julia Stiles has, by most standards, a beautiful and uniquely aesthetic face. However, there are often patients that have a fuller lower face, and this is not always due to the presence of adipose tissue, especially since many such examples, line Julia Stiles, are also fit. The fullness of the lower face, on a frontal view, is heavily dependent upon the bony framework of the face, specifically the mandible, as well as the fullness and bulk of the masseter muscles, which are key muscles of mastication. The bony skeleton can be contoured only with significant surgery that is riddled with potential complications, including a prolonged recovery. However, typical jaw contouring surgeries often focus more on smoothing out prominent jaw angles in women (known as gonial angles) than reducing the lower facial width. Reducing the size of the masseter muscles however, can be as easy as a simple botox treatment. Botox acts to partially paralyze the muscle, resulting in a gradual atrophy of the muscle, leading to a decrease bulk of the tissues and therefore a narrower width of the lower face. This type of treatment is very popular in Asian cultures, where there is a strong demand for a narrower, gentler, contour of the feminine lower face. Because the masseter muscle is being partially paralyzed, there is often a temporary period of difficulty chewing, especially thick foods, like steak, but because all other major muscles of mastication, especially the temporalis muscle, are not affected, the body compensates rather rapidly. Some patients may fall into the trap of undergoing liposuction of the face. In my opinion, liposuction of the face is potentially problematic, because all of the fat of the face is vital to a smooth and youthful contour, especially in women. Removal of subcutaneous fat from any aspect of the face has the potential to lead to contour anomalies that are much more aesthetically problematic than the original fullness of the face. Please consult with a board certified facial plastic surgeon for further detailed recommendations and an in-person evaluation prior to seeking any cosmetic therapy to the face. Best of luck!

 Hi, I have performed many facial shaping procedures using dermal fillers, silastic facial implants (cheek implants, chin implant, lip implants), liposuction and/or facelifts for over 30 years.  From the photos, your cheeks are very flat in the front and there is excess fat in the lower face.  These combine to create a wide, rectangular shaped face.  
 Following my facial beauty principles, women look the most feminine, youthful and attractive with heart shaped faces.  Heart shaped faces have cheeks that are full and round in the front.  Cheek augmentation with a dermal filler or using cheek implants for a permanent enhancement will create full, round cheeks that will feminize the entire face.  Liposuction would be performed to reduce the excess fat for further shaping of the cheeks and face.
 The back portion of the jaw line can be augmented using precise placement of a dermal filler that will create more shape without masculinizing the jaw line and face. The photos do "not" show evidence of "jowls" in the lower face which remain the main indication for any type of SMAS facelift as described below.  For that reason, no facelift procedures would appear warranted.  I have performed many SMAS facelifts for over 30 years and have performed many minimally, invasive SMAS facelifts.  If you have "jowls” these are sagging facial tissues and the main indication for some form of a SMAS facelift.  The underlying SMAS layer, of the face, must be dissected, lifted, trimmed and re-sutured (not merely folded or suspended with threads or sutures that will not last).  The excess skin is then removed and the facelift incisions closed.
My most popular facelift is the minimally invasive, short incision facelift that has all the benefits of more invasive facelifts (traditional, mid-face, deep plane, cheek lift and subperiosteal facelifts) but with these added benefits:
very small incisions and no incisions extend or are placed within the hair.
minimal tissue dissection = less bruising and swelling = rapid recovery ( several days instead of weeks or months with the more invasive type facelifts mentioned)
can be performed in 90 minutes or less, with or without general anesthesia
no incisions within the hair = no hair loss
excess fat can be removed from the face and neck
excess skin removed from the face and neck
cheeks, chin and jaw line can be augmented with dermal fillers (I prefer Restylane Lyft) or facial implants
most patients fly back home to parts all over the world in as little as 3 days post-op
I combine facial shaping with every facelift procedure.  When jowls are present, these should be done in concert and not alone or separately in order to create a naturally, more attractive face.
Hope this helps.

Generically, faces can be thinned with reducing the jaw angles and muscles, removing cheek fat, thinning the chin and placing implants in strategic position(s).  This is best determined with an in-office exam. Best wishes.