Hyaluronic Acid Filler

What is it?

Hyaluronic acid (HA) is a polysaccharide that is also found in the body's own tissue. It holds moisture in the skin and contributes to structural support; the amount decreases with age. The HA used in filler treatments is a form that has been cross-linked into a gel and processed so that it stays in the tissue for longer.

Most of the facial fillers sold under different names contain the same active substance. The difference lies not in the substance but in the cross-link density of the gel, its fluidity and the area it was designed for. That is why the right question is not "which product is better" but "which gel structure suits this area".

Hyaluronic acid filler is a treatment in which cross-linked HA gel is injected into the target layer beneath the skin to create volume and structural support. The gel provides mechanical support where it is placed and binds the water around it; the effect is visible from the moment of injection. Cross-linking is the process that slows the breakdown of the gel by tissue enzymes: the higher the cross-link density, the firmer and longer-lasting the gel; the lower it is, the more fluid and softer the gel. That is why there is no single "best gel": fluid forms are preferred in areas with a lot of movement, such as the lips, and denser forms in the cheekbones and jawline, where deep support is needed. Injecting gel of the wrong density into the wrong area is among the most common causes of palpable firmness and an appearance that does not look natural with movement. The effect is temporary in every case: the gel is absorbed over time and the tissue returns to its own state.

Why does it matter that it can be reversed?

The most important way in which hyaluronic acid differs from other filler classes is that it can be dissolved with the enzyme hyaluronidase. This has two separate implications. The first is aesthetic: a result you do not like, find excessive or that has remained asymmetric can be reversed without waiting. The second, and more important, is safety: in a rare but serious situation such as the gel blocking a blood vessel, the fact that the injected substance can be dissolved forms the basis of emergency treatment. Biostimulator fillers such as calcium hydroxylapatite and poly-L-lactic acid have no such route back. This does not make HA "better" — different classes are used for different goals — but it is a concrete difference to be aware of when making a decision. Dissolving is also a procedure carried out by a physician; there is no method that can be used at home, and it requires an assessment of its own.

1. Cross-link density determines the firmness of the gel and how long it stays in the tissue.
2. The area and the goal determine the choice of gel; there is no single universal product.
3. The effect is visible at the moment of injection; the final appearance settles as the swelling resolves.
4. Tissue enzymes break the gel down over time; where needed, it can be dissolved earlier with hyaluronidase.

Treatment Areas

• Lips — fluid gel, volume and border (detail: Lip Filler page)
• Nose — limited volume, an area that needs particular care because of its blood vessels (detail: Nose Filler page)
• Jawline and chin — denser gel, structural support
• Under the eyes — an area that needs fine, careful technique
• Cheekbones and temples — deep support
• Not possible: skin spots, pores and tissue quality problems are not what filler addresses

Procedure Steps

1. Assessment

   The target area, existing proportions and expectations are discussed; this is where it is decided whether the goal can be met with filler.

2. Choice of gel

   The density of the gel is chosen according to how mobile the area is, the thickness of the skin and the level of support aimed for.

3. Preparation

   The area is cleaned with antiseptic; a topical anaesthetic is applied if needed.

4. Treatment

   The gel is placed gradually, in small amounts, with attention to the vascular anatomy of the area.

5. Assessing the result

   The result is assessed after the swelling has resolved; which symptoms are urgent is explained in writing.

Duration and Longevity

The effect of hyaluronic acid fillers is not lasting. The gel is gradually broken down by tissue enzymes and the area returns to its own state. The main factors that determine the duration are how mobile the area is, the cross-link density of the gel, the amount injected and the person's metabolism; for that reason it would not be right to give a single figure. For area-specific detail, the relevant page is more useful: the durability and re-treatment rates drawn from our clinic's own patient series are published on the Lip Filler page, because the series belongs to lip filler.

Who is it suitable for?

• Adults aged 18 and over
• People aiming for a change in volume, contour or proportion in a specific area
• People who come knowing that the result is temporary
• People who prefer a treatment that can be reversed
• People expecting a realistic, limited change

Who is it not suitable for?

• Pregnant and breastfeeding people
• People with a known allergy to hyaluronic acid
• People with an active skin infection
• People with a bleeding disorder or taking blood thinners (a physician's assessment is needed)
• People looking for a solution to skin quality, spots or pores — this is not what filler addresses
• People looking for a permanent result: hyaluronic acid fillers are temporary by definition; if what you expect is permanence, you need to consider other options with your physician.

Aftercare

• You can apply cold to the area intermittently during the first 24 hours.
• For the first 24-48 hours, avoid alcohol and any blood-thinning medicines your physician has not approved.
• Stay away from hot environments and intense exercise in the first days.
• Do not massage the treated area yourself or try to shape it.
• Keep using sunscreen.
• If pain increases, the skin turns white or a colour change spreads, contact the clinic without waiting.

Possible Side Effects

• Temporary swelling and redness
• Small bruises and tenderness at the injection points
• Asymmetry or a contour different from what was expected — correction or dissolving may be considered
• Palpable firmness or a nodule — mostly due to a mismatch between the density of the gel and the area
• Rare but serious: tissue damage caused by gel blocking a blood vessel. The fact that hyaluronic acid can be dissolved is the basis of emergency treatment in this situation.
• For area-specific side-effect rates, see the relevant page; our clinic's numerical series belongs to lip filler.

Frequently Asked Questions