Who is hyaluronic acid injection suited for? Concerns it addresses and body conditions to disclose beforehand

Hyaluronic acid injection is best suited for people who want to address wrinkles or volume loss in the cheeks and chin through injection rather than surgery. The Japanese Society for Aesthetic Plastic Surgery guidelines recognize hyaluronic acid injection for facial wrinkles as effective and assign it a recommendation level of 2 (weakly recommended)[1]. On the other hand, careful judgment is needed for pregnant women, people with active infection or inflammation, and those with autoimmune disease.

What concerns is it suited for?

FDA-approved uses include treating wrinkles such as nasolabial folds and fine lines around the mouth, as well as adding volume to the lips, cheeks, and chin[2].

In a study of injections for cheek volume loss, chin recession, and blurred jawline definition, the appearance scores of 19 subjects improved immediately and were maintained through 12 months overall[3]. However, this was a small study using only one product with no comparison group.

How does it differ from other injectables?

The main difference is that it can be dissolved afterward. Hyaluronic acid can be rapidly broken down by the enzyme hyaluronidase[4]. If the result does not meet your expectations or complications occur, there is a way to reverse it.

Other injectables cannot be dissolved and removed, so they should be used with caution[4]. Also, softer formulations of hyaluronic acid are described as better suited for treating fine wrinkles[5].

What body conditions should you disclose before treatment?

In one study, the following individuals were excluded: those with allergies to the ingredients, those with compromised immunity, those with bleeding disorders, those with active infection or inflammation, and those with skin disease[6]. People who had facial injections or cosmetic surgery within 6 months, as well as those who were pregnant or breastfeeding, were also excluded[6].

These were study enrollment criteria and not necessarily a blanket prohibition list for everyone. However, they provide clues to understanding why physicians exercise caution.

Regarding delayed reactions that may occur over time after injection, an expert group has established guidelines. Active autoimmune disease and recent dental treatment are cited as factors in delayed reactions[7]. Type 1 diabetes does not necessarily disqualify you if it is well controlled and wound healing is normal[7].

If you have had an allergic reaction to a bee sting, you may also experience an allergic reaction to the dissolving medication[7]. If you have acne, rosacea, or dermatitis, your skin barrier is weakened, so disclose this beforehand as well[7].

Are there unsuitable uses?

Yes. Hyaluronic acid injection for breast enlargement is "strongly recommended against" in the guidelines of the Japanese Society for Aesthetic Plastic Surgery[1]. This is because of potential capsular contracture (hardening around the injected material) and the risk of interfering with breast cancer screening[1].

Even in the face, caution is needed against over-injection. Using a firm formulation too superficially or injecting too much can result in an unnatural, puffy appearance[4]. The key to a natural look is the principle of "injecting only what is needed to fill the gap."

How much should I be concerned about side effects?

Most are mild and resolve over time[8]. However, rare serious complications that do not reverse have been reported[8]. If the injection enters a blood vessel, there are reports of skin necrosis and blindness[1].

There are differences by location. Cheeks, lips, and mouth area were reported to have higher rates of swelling, nodules, and firmness compared to nasolabial folds[8].

How do you determine if it is right for you during consultation?

Expert groups recommend that physicians obtain a thorough history and ensure you understand the explanation[7]. At minimum, you should confirm medications and foods to avoid at least 1 week before the procedure[7].

During the consultation, inform your doctor of the area of concern and whether it can be addressed with hyaluronic acid, your medical history, current medications, recent and upcoming dental treatments, and any allergies. This is an aspect that cannot be determined from an article alone.