The tear trough deformity (or sunken under eyes) is a concave hollowing that develops under the eyes that becomes more pronounced as we age. It is the junction between two facial muscles that is often made more obvious by bulging of the fat pad under the eye. It leads to a shadow under the eye which gives a tired and worn out appearance. Tear trough filler is an advanced technique and should only be performed by an experienced medical professional. Tear trough filler can transform the delicate undereye area, significantly reducing the appearance of aging and dark circles.