What does hyaluronic acid do in the body?
Hyaluronic acid, also called HA or hyaluronan, is a water-binding carbohydrate found naturally in skin, joints and other tissues. In the skin, it helps maintain hydration and the environment around cells.
HA is different from collagen, the protein that provides structural support. Dryness, wrinkles and changes in facial volume have several causes; they do not establish that you need HA injections.
Hyaluronic acid skincare and fillers: what is the difference?
HA in a serum or moisturizer helps hydrate the skin. The effect depends on the complete formula, including the form of HA and other ingredients. Hydrated skin may look smoother, but a cream does not replace lost facial volume in the way an injectable filler can.
HA dermal fillers are injectable gels used to add volume, soften selected lines or alter contours. The product and treatment area matter. Skincare and injectable products are not interchangeable, and a skincare serum must never be injected.
For dry skin, choosing a suitable moisturizer is usually a more relevant starting point than considering filler. Persistent irritation, cracking or a rash needs assessment rather than simply adding more skincare products.
Are all HA injections the same?
No. Many HA fillers are cross-linked, meaning the HA chains are joined to make the gel more resistant to breakdown. Products differ in firmness, flexibility, composition and intended use. A softer gel is not automatically safer, and cross-linking alone does not tell you where a product should be used.
Some HA injections are intended to improve skin quality rather than add substantial volume. “Skin booster” is a broad treatment term, not one standardized formula or proof of superior hydration. Hybrid injectables may contain HA together with another material, so their effects and options for removal need separate consideration.
Choose by the exact product and the concern being treated, with a doctor’s assessment. Brand names or descriptions such as “micro-molecular” do not establish that different products are equivalent.
What can HA fillers improve?
Depending on the formulation and its intended use, an HA filler may soften certain folds, restore some lost volume or change facial contours. It does not address every cause of wrinkles or loose skin, and more volume is not always the right answer.
A natural-looking result is a treatment goal, not a guarantee. The doctor should explain what is realistic for your anatomy and discuss alternatives, including choosing no procedure.
Is hyaluronic acid safe?
The fact that HA occurs in the body does not make every HA product risk-free. A moisturizer and an injected gel have different risks. With skincare, other ingredients in the formula can also cause irritation or allergic reactions.
After filler injections, bruising, redness, swelling or tenderness can occur. Infection, persistent lumps and delayed inflammatory reactions are also possible. Some problems appear weeks, months or longer after treatment.
Accidental injection into a blood vessel can interrupt the blood supply and cause tissue damage, blindness or stroke. These complications are uncommon but can be permanent, even when an approved product is used.
Seek immediate medical attention for unusual or worsening pain, white, gray, blue or mottled skin, or any change in vision after filler treatment. Sudden weakness, facial drooping or difficulty speaking also needs emergency care. Do not wait for a routine review or try to manage these symptoms at home.
How long do HA fillers last?
There is no single duration for all HA fillers. Visible results depend on the exact product, treatment area and individual response. Ask about evidence for the product proposed for you rather than relying on a general promise of a set number of months.
Visible improvement and complete disappearance of the material are different. A small MRI study found residual HA filler in the mid-face years after treatment; this does not mean everyone will have the same persistence or that the cosmetic benefit lasts that long. Reassess the area before deciding on further treatment instead of automatically topping up on a fixed schedule.
Can HA fillers be dissolved?
A doctor may use hyaluronidase, an enzyme that breaks down HA, to reduce unwanted HA filler. The response varies, and further assessment or treatment may be needed. Dissolving can itself cause swelling, bruising or an allergic reaction.
“Dissolvable” does not mean fully reversible or risk-free. Hyaluronidase cannot reliably undo every complication or guarantee restoration of the original appearance or lost vision. It does not dissolve non-HA materials in the same way; a hybrid product may contain components that remain.
Who should consider HA fillers, and what are the alternatives?
Suitability depends on your concern, anatomy, health history and the proposed product. Being new to fillers, younger or older does not by itself make treatment appropriate. Tell the doctor about previous injections, allergies, medical conditions and medicines or supplements you use. Pregnancy or breastfeeding also needs discussion before elective filler treatment. Do not inject an area with an active skin infection; have it assessed and treated first.
Other fillers use different materials, such as calcium hydroxylapatite or poly-L-lactic acid, and are not removed with hyaluronidase. Fat grafting uses your own fat and involves a separate procedure with its own recovery and risks. None is the best choice for everyone; compare the intended benefit, limitations and correction options.
What should you check before treatment in Thailand?
Use a licensed medical clinic and a doctor experienced with the proposed procedure. Ask for an explanation you understand before agreeing to treatment.
- Confirm the exact brand and product name, intended use and current Thai authorization. Overseas approval does not by itself establish Thai authorization or suitability for every treatment area.
- Discuss the expected change, alternatives and risks for the area being considered. Ask how complications are recognized and managed.
- Request the total cost, the product and quantity included, and whether review visits or corrective treatment carry extra charges.
- Agree on follow-up arrangements and how to obtain urgent help if a problem develops.
For a consultation or a current treatment quote, contact Smooth Clinic. The appropriate option depends on assessment, not simply on whether a product contains HA.
How should you care for your skin after HA filler?
Follow the treating doctor’s instructions for your product and treatment area, including when to resume exercise, heat exposure and skincare. Do not press or massage the area unless specifically instructed. Seek review for persistent or increasing swelling, redness, pain or lumps; the warning signs above need immediate care.
References
- American Academy of Dermatology. How to pick the right moisturizer for your skin.
- U.S. Food and Drug Administration. FDA-Approved Dermal Fillers. Materials and product-specific uses; U.S. authorization is not Thai authorization.
- U.S. Food and Drug Administration. Dermal Fillers (Soft Tissue Fillers). Risks and patient information.
- U.S. Food and Drug Administration. Executive Summary: General Issues Panel Meeting on Dermal Fillers, 2025. Limitations and risks of filler removal.
- Master M, Azizeddin A, Master V. Hyaluronic Acid Filler Longevity in the Mid-face: A Review of 33 Magnetic Resonance Imaging Studies, 2024. A small imaging series, not a prediction of visible results for every patient.
- Murray G, Convery C, Walker L, Davies E. Guideline for the Safe Use of Hyaluronidase in Aesthetic Medicine, 2021. Clinician guidance, including allergy and variable response.
- American Academy of Dermatology. Fillers: Preparation.