Best Practices for HA Filler Injection Techniques
The success of a hyaluronic acid (HA) filler treatment depends as much on technique as on the product. Choosing the right plane, instrument, volume and injection speed for each area improves results and reduces the risk of complications. This guide summarizes safe and effective practices for clinicians.
Pre-Injection Assessment
- Take a complete medical history: allergies (including lidocaine), anticoagulants, autoimmune conditions, history of cold sores, previous fillers and their type.
- Analyze the face at rest and in motion, and take standardized photos.
- Assess skin quality, volume loss and bone support.
- Discuss goals and set realistic expectations.
- Obtain informed consent and document the plan.
Injection Techniques by Area
- Cheeks and chin: a firm, cohesive gel placed deep, on the bone, with a needle in small boluses, or in the subcutaneous plane with a cannula.
- Jawline: a firm gel in small boluses along the bone or a linear technique with a cannula.
- Tear troughs: a soft, low-hydrophilic gel placed deep in small amounts, often with a cannula.
- Nasolabial folds: a medium-firmness gel, deep at the base of the fold and more superficial along it, depending on the product.
- Lips: a soft gel, linear threading along the border and small deposits in the body of the lip.
- Fine lines: a very soft gel or a skinbooster, placed superficially in tiny amounts.
Products in ranges such as JUVÉDERM®, RESTYLANE®, BELOTERO®, TEOSYAL®, REVANESSE®, STYLAGE® and SAYPHA® are designed for specific depths and areas; always follow the instructions for use.
Safety Measures and Risk Reduction
- Master the vascular anatomy and danger zones: glabella, nose, nasolabial area, temples and tear troughs.
- Inject slowly, with low pressure and small volumes.
- Keep the needle moving or use a cannula in high-risk areas.
- Aspiration can be part of the routine but does not guarantee safety on its own.
- Watch the skin colour and the patient’s reactions throughout.
- Keep hyaluronidase available and follow a written emergency protocol.
- Respect strict aseptic technique.
Our article on dermal filler complications describes the warning signs.
Combining HA Fillers With Other Treatments
HA fillers combine well with neuromodulators, skinboosters and biostimulators. Plan the sequence carefully, respect intervals and avoid treating the same area with energy-based devices immediately after an injection. See our article on combination treatments.
Post-Injection Care and Follow-Up
- Give clear written aftercare instructions.
- Explain normal reactions and warning signs, with a way to reach the clinic after hours.
- Plan a follow-up at two to four weeks.
- Record products, lots, volumes and sites in the file.
- Report any suspected adverse reaction to Health Canada through the Canada Vigilance Program.
In Canada, who may inject fillers depends on the province and the professional college; injectors should practise within their scope. Clinics can find all products in our hyaluronic acid fillers category.
Glossary
- Bolus: a small deposit of product in a single point.
- Linear threading: product deposited while withdrawing the needle or cannula.
- Fanning: several linear passes from a single entry point.
- Cannula: a blunt-tipped instrument that limits entry points and can reduce trauma.
- Hyaluronidase: an enzyme that dissolves HA.
References
Lipko-Godlewska, S., et al. (2021). Whole-face approach with hyaluronic acid fillers. Clinical, Cosmetic and Investigational Dermatology. https://www.dovepress.com/whole-face-approach-with-hyaluronic-acid-fillers-peer-reviewed-fulltext-article-CCID
Colucci, L., et al. (2025). Hyaluronic acid filler usage and technique for the facial rejuvenation. PMC. https://pmc.ncbi.nlm.nih.gov/articles/PMC12037087/
Corduff, N., et al. (2022). Current practices in hyaluronic acid dermal filler treatment in Asia-Pacific. Dovepress. https://www.dovepress.com/current-practices-in-hyaluronic-acid-dermal-filler-treatment-in-asia-p-peer-reviewed-fulltext-article-
Dr. Tim Pearce. (2020, September 3). Injection techniques: Good practice for dermal fillers. https://drtimpearce.com/2020/09/03/injection-techniques-101-good-injection-techniques-for-dermal-fillers/
The Plastics Fella. (2025, April 20). Injectable fillers: Classification, indications, & techniques. https://www.theplasticsfella.com/fillers/
