A weak chin is when your lower jaw bone is underdeveloped which makes your chin sit slighlty backwards towards the neck, or the position of the lower jaw is actually set back compared to the upper jaw.
As you age the cheeks lose volume and facial fullness is reduced. Facial bones also lose volume, and as elastin declines, skin laxity and sagging increases.
Gummy smile is a phenomenon that when some people smile their upper lip elevates too far above their upper lip, exposing gums and producing an unattractive smile.
Some people have an overactive muscle in their chin. Increased tension in this muscle causes irregularities to appear in the skin's surface such as lines and small dimples.
Neck bands are most often formed by the Platysma muscle, which extends from the collarbone up the sides of the neck. Repeated muscle firing can result in the jaw tissue dropping and the formation of neck bands.
While a square jawline and enlargement of the masseter muscle is distinctly masculine, female patients desire a softer oval shaped feminized facial shape, with a gentle more graceful jawline.