HA Filler

As a wrinkle-and-depression treatment, HA filler targets lines and hollows that are visible even when the face is at rest. Commonly discussed areas include nasolabial folds, tear troughs, marionette lines, and volume loss at the temples or mid-face. For the material itself, see the hyaluronic acid entry; small-dose contour refinements such as chin or nose adjustments belong to the HA touch-up entry. This entry focuses on using the gel to fill creases and hollows.

It works best on static creases and depressions caused by volume loss beneath the skin. It does not relax the muscles behind dynamic expression lines—those are usually discussed in the context of botulinum toxin—nor does it lift sagging tissue the way surgery can, or change skin texture and pigmentation. Because the body gradually breaks the gel down, the result is temporary, and maintenance injections are needed to keep it.

Hyaluronic acid is a water-binding molecule found naturally in skin; filler products cross-link it into a gel that holds its shape after injection. At the appointment, the physician assesses the face, marks the injection plan, and cleans and disinfects the skin. A topical numbing cream may be applied first, and many filler products also contain lidocaine. The gel is then placed with a fine needle or a blunt-tipped cannula, which can feel like pressure, stinging, or brief aching.