cannula -- a hollow metal tube used in liposuction and fat grafting. The very tip usually is blunt for safety purposes. Newer cannulas have diameters that range from 1-5mm.

hematoma -- a collection of blood that develops after the skin has been closed during a surgergical procedure. Untreated, hematomas can beome infected, produce problems with wound healing, or become replaced by fibrous tissue to produce a permanent mass.

seroma -- a collection of clear, straw-colored fluid that collects underneath the skin following plastic surgery. It is recognized by a bulge, and or a fluid wave. Untreated, a seroma can produce problems with wound healing.

subcutaneous -- an adjective describing the location of something, the location being between the skin and underlying muscle or bone.