Woman getting lip injection (Photo : Gustavo Pring/Pexels)
Woman getting lip injection.

A doctor has warned against overfilling the lips and other areas as he said fillers stay in the skin for years even if it seems like they're gone.

Fillers, which add volume and shape to lips, cheeks and other areas, are usually made of hyaluronic acid, a substance naturally found in the body. Their results are temporary and can last anywhere between six to 18 months before the materials in the fillers are gradually absorbed by the body, according to Harvard Health. Many patients get touch-ups once the "effect" wears off.

Cosmetic doctor and liposuctionist Gavin Chan, however, told Prestige that while their effect is temporary and typically lasts months, the potential longevity of fillers and their properties is much longer.