Is swelling normal after hyaluronic acid injection? Symptoms to monitor and when to contact the clinic

Swelling and bruising after hyaluronic acid injection are mostly temporary reactions that occur immediately after injection. Reports classify those appearing within 14 days of injection as "early-phase reactions," and redness, swelling, and bruising are considered common reactions[1]. On the other hand, severe pain, changes in skin color, and eye symptoms are signs that warrant a medical consultation, separate from normal swelling.

How long does swelling and bruising take to resolve?

Swelling and bruising appear immediately after injection and gradually subside over time[1]. The shallower the injection site, the more likely these reactions are to occur, and small irregularities are often caused by shallow injection, according to reports[1]. Most cases are temporary[2].

The timeline for resolution varies depending on the injection site and amount. It is helpful to ask about the expected timeline for your case before the procedure so you can plan accordingly.

People taking blood-thinning medications as prescribed are more prone to bruising[3]. However, there is no need to stop the medication on your own, and injection can be performed while continuing the medication[3].

Can lumps or swelling appear later?

Yes. Between 14 days and 1 year after injection, lumps or infection may occur, and reactions occurring after 1 year are also separately reported[1].

The cause of lumps appearing later is not single. Immune response, bacterial contamination, and the properties of hyaluronic acid as it breaks down are thought to be involved individually or in combination[4]. If you notice a lump, you are advised to report it immediately regardless of when it appears[3].

What symptoms warrant immediate contact with the clinic?

Whitening of the skin, net-like patterns appearing, eye pain, double vision, blurred vision. These are signs of vascular complications[3]If eye symptoms develop, injection must be stopped immediately and addressed.[3].

Easy to overlook is when it appears as ordinary bruising. When a vein is compressed, a dull pain persists and swelling or purple reticular patterns may appear.[2]If pain is severe or does not subside, do not assume it is bruising—contact the clinic.[2].

Such complications are rare. Vascular occlusion is reported to occur at a maximum of 3 times per 1,000 injections, excluding vision loss.[1]Vision loss occurred in 0.0008% of cases.[5].

Why are the first 3 days after injection important?

Vascular complications can occur within 72 hours after injection.[3]For this reason, patients planning travel during that period who cannot reach the clinic quickly are advised to postpone injection.[3].

Hyaluronic acid can be dissolved by the enzyme hyaluronidase. Having this medication prepared and ready to use is essential.[1].

What can be done before the procedure to ensure smooth recovery?

Medications that thin the blood that are not prescribed are recommended to be avoided starting about 1 week before the procedure.[3]People prone to oral herpes may use medication beforehand.[1].

According to the guidelines of the Japan Society of Aesthetic Surgeons, hyaluronic acid injection is effective for wrinkles, while caution regarding vascular complications is required.[6]Disclose all your plans and pre-existing conditions in advance.

What should you ask at your consultation about your expected recovery?

Swelling resolution varies depending on the injection site, volume, depth, and medications you are taking. An article alone cannot determine how many days you need to take off.

At your consultation, confirm the timeline for swelling and bruising to resolve, symptoms to report within 3 days after injection, and after-hours or weekend contact information.