
Hyaluronic acid and collagen are natural substances which are constituents of the ground matrix of the dermis. They are hypoallergic and are well tolerated, being biologically degradable. Lactic acid and soluble bone fillers are used for correcting larger areas such as refining facial contours and features and filling sunken parts of the face eg. cheeks, cheekbones, nose-refining-otherwise known as "Liquid Lifting". |