Filler is a soft tissue filler injected into the skin at different depths to help fill in facial wrinkles, provide facial volume, and enhance facial features. Filler can also restore a more smooth appearance. Filler can increase fullness of lips, cheeks, chin, under-eye hollows, jawline, and correct acne scars Most fillers are temporary because they are eventually absorbed by the body due to the fact that the filler consists of hyaluronic acid which is a naturally occurring polysaccharide that is present in skin and cartilage.