What is an unsuccessful hyaluronic acid injection?
The term “unsuccessful” covers very different realities depending on the patient and clinical situation. Some people describe an injection as unsuccessful when: • the face looks swollen, • volumes look artificial, • features are frozen, • one facial element (often the lips or cheekbones) looks disproportionate, • the result lacks a natural appearance. Other situations involve genuine medical complications: • nodules, • product migration, • persistent swelling, • vascular compression, • exceptionally, skin necrosis. It is essential to distinguish a temporary irregularity related to post-injection swelling from a genuine aesthetic imbalance or technical complication. After an injection, tissues continue to change for several days. The result can only be assessed reliably after a settling period, generally between one and two weeks depending on the treated areas.Causes of an unsuccessful hyaluronic acid injection
- Excess injected product: excess hyaluronic acid is one of the main causes of unnatural results. When too much product is injected, the face can look swollen and older, and expressions change.
- Unsuitable indication: treating an area that does not need treatment can unbalance the face instead of enhancing it. Some indications are better addressed with botulinum toxin, treatments to improve skin quality, surgery or sometimes no treatment at all.
- A product unsuitable for the area: different types of hyaluronic acid have varying degrees of cross-linking, volumising capacity and affinity for water. Each anatomical region requires a specific product adapted to skin thickness, tissue mobility and the desired goal.
- Inappropriate injection technique: the correct injection depth, angle, quantity of product and injection plane are essential for an attractive, natural result. Poor technique can cause asymmetries, product migration or visible irregularities.
Unsuccessful hyaluronic acid injection: what complications can occur?
- Prolonged swelling: moderate swelling is common after an injection. However, swelling persisting for several weeks may be due to excess product, an unsuitable indication or a local inflammatory reaction.
- Nodules and irregularities: small palpable or visible lumps can appear when hyaluronic acid is injected too superficially, distributed unevenly in the tissues or used in excessive quantities. They may be felt or even visible in areas where the skin is particularly thin. These irregularities may go unnoticed at rest but become more visible under certain lighting, from particular angles or during facial movements and expressions.
- Hyaluronic acid migration: in some cases, the product can gradually move outside the original injection area. This phenomenon is related to a technical error and is particularly observed in the lips, under-eye area or nasolabial folds.
- Tyndall effect: the Tyndall effect is a bluish discolouration visible beneath the skin when hyaluronic acid is injected too superficially. This complication mainly affects the under-eye area and regions with very thin skin.
- Vascular compression: the most serious complication remains vascular occlusion. It occurs when a blood vessel is compressed or blocked by the injected product. Warning signs include intense pain, skin blanching, mottling and rapid changes in skin colour. Serious complications remain rare when a procedure is performed by an experienced doctor.
What should you do after an unsuccessful hyaluronic acid injection?
- Seek medical advice promptly: in the event of an aesthetically poor result or unusual symptoms after a hyaluronic acid injection, it is important to consult the injecting doctor. A clinical examination identifies the cause of the problem and allows appropriate care to be proposed.
- Dissolving hyaluronic acid: in certain rare but serious situations, particularly vascular compression or occlusion, hyaluronidase may be necessary. This enzyme rapidly breaks down hyaluronic acid to limit the risk of skin or vascular complications.
- Monitoring and natural progression: moderate reactions such as mild swelling, bruising or temporary asymmetry subside spontaneously in the days following injection. Nevertheless, attentive medical follow-up remains essential to monitor progress and ensure patient safety.
Can you have further injections after a correction?
Yes, in some cases. After any necessary dissolving and tissue stabilisation, further injections may be considered with a more appropriate approach. However, it is important to wait for inflammation to resolve, reassess facial volume and correct the initial cause of the problem.How long should you wait before correcting an unsuccessful injection?
The time before correcting an injection depends above all on the problem observed. For simple post-injection swelling, it is often preferable to let tissues settle naturally for a few days, sometimes up to two weeks depending on the treated area. Conversely, some signs require prompt care. Significant pain, skin blanching, signs suggesting vascular injury or a marked inflammatory reaction should lead to medical assessment without delay. If in doubt, prompt advice is always preferable.How can you avoid an unsuccessful hyaluronic acid injection?
- Choose an experienced doctor: hyaluronic acid injection is a medical procedure requiring thorough anatomical knowledge, an understanding of facial ageing and mastery of possible complications.
- Preserve facial harmony.
- Avoid cumulative excess: the most artificial results often develop gradually after repeated injections over the years. Continually adding product without reassessing overall facial balance can make volumes excessive and impair the natural harmony of the features.
- Regular follow-up: regular follow-up provides perspective on facial changes, allows treatments to be adjusted when necessary and preserves a natural, coherent result over time. In some cases, the most appropriate decision is simply not to reinject certain areas.
Can a natural result be restored after an unsuccessful injection?
In the vast majority of cases, yes. Most results considered unsatisfactory after a hyaluronic acid injection can be corrected or improved with appropriate care. The first step is to identify the precise cause: excess volume, asymmetry, irregularity, an unsuitable indication or simply swelling still present after the session. Depending on the situation, it may be preferable to wait for tissues to settle naturally, perform a targeted correction or, when necessary (an emergency situation), dissolve some or all of the product with hyaluronidase. When performed rigorously and with respect for facial anatomy, this approach most often restores a harmonious, natural result.Scientific literature
Recent scientific literature highlights that complications of hyaluronic acid injections remain rare but well documented. Reference publications on this topic include:- The review “Complications des injections d’acide hyaluronique en médecine esthétique faciale”, published in the Revue Médicale de Bruxelles (CUYLITS et al., 2024), describes the main early and delayed complications of facial injections, including nodules, swelling, granulomas and ischaemic complications. The authors note that serious complications remain rare — estimated at around 0,07 % — but require immediate recognition and management.
- The university thesis “Complications vasculaires faciales après injection de produits de comblement” (DUMAS, 2022) analyses cases of post-injection facial arterial ischaemia and highlights the importance of extremely early diagnosis to limit the risk of skin necrosis and permanent consequences.
- Reviews of hyaluronidase use, particularly Agathe Lafarge's study (“Utilisation de la hyaluronidase dans les complications des fillers”), show that this enzyme is now the reference treatment for dissolving hyaluronic acid in the event of a vascular complication.
