In short. Hyaluronic acid fillers are injectable gels that restore facial volume, soften folds and refine contours. The gel is temporary, typically lasting about 6 to 18 months, and can be dissolved with hyaluronidase, so it suits patients who want a reversible option while accepting repeat treatment. Filler does not lift significantly loose skin.
Key points
- Hyaluronic acid is a sugar molecule the skin already contains, binding water to restore volume.
- Results appear immediately but last about 6 to 18 months, depending on area, product and metabolism.
- The gel can be dissolved with hyaluronidase, though dissolving is reserved for corrections or complications.
- Small volumes placed in the correct anatomical layer build support gradually; undercorrection is easier to adjust.
- Filler does not lift significantly loose skin, where surgery or energy-based devices may suit better.
What the gel is, and how long it lasts
Hyaluronic acid fillers are injectable gels used to restore facial volume, soften folds, and refine contours. Hyaluronic acid is a sugar molecule your skin already contains; it binds water and gives tissue its plumpness. The gels used in medicine are laboratory-made versions, cross-linked so they break down slowly. Results are visible immediately but are temporary, typically about 6 to 18 months depending on the area treated, the product chosen, and individual metabolism. Nothing about filler treatment is permanent, and no result is guaranteed.
What does the assessment look at?
Every plan begins with a medical consultation and facial assessment. Good filler work starts with analysis, not product. Your practitioner examines skin thickness, bone support, fat compartments, and how your face moves. Volume loss in one area often creates shadows elsewhere, so the question is rarely where the fold is, but why it appeared. Photographs, lighting from several angles, and sometimes facial measurements guide the plan.
How the gel is placed
The gel is placed into a specific tissue plane, deep on bone for structural support, or more superficially for fine lines, where it occupies space and attracts water. Because hyaluronic acid can be dissolved with the enzyme hyaluronidase, this filler class is considered reversible, which is one reason it is the most widely used. Dissolving is itself a medical procedure and is reserved for corrections or complications, not routine changes of mind.
Who is a suitable candidate?
Suitable candidates are adults with realistic goals: softening a fold, restoring cheek support, or balancing a profile. Filler does not lift significant loose skin; surgery or energy-based devices may be better for that. Collagen-stimulating injectables such as PLLA or PCL work differently and suit some patients better. Your consultation should compare these options honestly.
Why small volumes are built over sessions
We favour small volumes placed in the correct anatomical layer, building support gradually over one or more sessions rather than filling aggressively in a single visit. Undercorrection is easy to adjust; overcorrection is not.
What happens on the day, and when is the result judged?
Treatment usually takes 20 to 45 minutes. Expect swelling and sometimes bruising for a few days; the settled result is judged at about two weeks, when any review or touch-up is planned. Strenuous exercise, alcohol, and pressure on the area are best avoided for the first 24 to 48 hours.
| Situation | What the gel can do | What it cannot do | Where the plan goes |
|---|---|---|---|
| A soft fold | Soften it by restoring support in the correct plane | Remove it permanently | Repeat treatment to sustain the effect |
| Lost cheek support | Restore volume deep on bone | Lift significantly loose skin | Surgery or energy-based devices compared |
| Fine lines | Be placed more superficially | Remove the line permanently | Skin-quality treatments staged alongside |
| A profile to balance | Refine the contour | Guarantee a result | A review at about two weeks |
| Significant loose skin | Offer little change | Lift the tissue | A surgical or energy-based opinion |
| A result you dislike | Be dissolved with hyaluronidase | Be treated as a routine change of mind | A medical procedure for corrections or complications |
The risks that need to be planned for
Common effects are temporary: redness, swelling, tenderness, and bruising. Lumps or asymmetry can occur and usually settle or can be adjusted. The rare but serious risk is vascular occlusion, where filler blocks a blood vessel and threatens skin or, very rarely, vision. Trained practitioners minimise this risk with careful technique and keep hyaluronidase and emergency protocols immediately available.
Combining filler with other treatments
Filler is often combined with botulinum toxin for dynamic lines, or with skin-quality treatments, staged rather than done all at once. Follow-up review lets your practitioner assess the settled result and plan maintenance, since repeat treatment is needed to sustain the effect.
When to seek urgent review
Severe or worsening pain, or skin that turns white, dusky, or shows a net-like mottled pattern after injection, needs urgent medical review. Any change in vision, however slight, is an emergency and needs immediate attention. Treatment should be deferred and discussed with a doctor first in pregnancy, breastfeeding, an active skin infection, or a bleeding disorder.
Sources
Internal links
Frequently asked questions
How long do hyaluronic acid fillers last?
Typically about six to eighteen months, depending on the area treated, the product chosen and individual metabolism. Nothing about filler treatment is permanent, repeat treatment is needed to sustain the effect, and no result is guaranteed.
Can hyaluronic acid filler be dissolved if I dislike the result?
Yes. This filler class can be dissolved with the enzyme hyaluronidase, which is one reason it is the most widely used. Dissolving is itself a medical procedure and is reserved for corrections or complications rather than routine changes of mind.
What is the most serious risk of filler treatment?
Vascular occlusion, where filler blocks a blood vessel and threatens the skin or, very rarely, vision. It is rare but serious. Trained practitioners minimise the risk with careful technique and keep hyaluronidase and emergency protocols immediately available.
Risks & Limitations
- Vascular occlusion — a time-critical emergency in which filler blocks a blood vessel. It can cause skin loss and, rarely, blindness.
- Nodules, lumps or granuloma formation, which may need treatment or dissolution.
- Infection at the injection site.
- Asymmetry or over-correction; over-treatment is harder to correct than under-treatment.
- Migration of filler away from the intended area.
- Temporary brow or eyelid droop after botulinum toxin, which resolves as the effect wears off.
- Bruising and swelling. All injectable results are temporary and maintenance is required.
When to Seek Care
- Severe pain out of proportion to the procedure, or skin turning white, grey, mottled or dusky — this is a vascular emergency; seek care immediately.
- Any change in vision — seek emergency care immediately.
- Fever, spreading redness, warmth or pus at an injection site.
- A hard, painful lump that is growing.
- Drooping eyelid, difficulty swallowing, or difficulty breathing after botulinum toxin.
References & Further Reading
- American Academy of Dermatology (AAD) — injectable safety information
- American Society of Plastic Surgeons (ASPS) — injectable guidance
- U.S. Food and Drug Administration (FDA) — approved filler and neurotoxin products
- National Medical Products Administration (NMPA, China) — approved product status
This page is patient education, not medical advice, and it does not cite individual studies. Discuss your own case with a qualified clinician. To arrange an assessment at Chongqing West District Hospital, see Contact & Consultation.