Sunken Cheek Fillers: Essential Things to Know Before You Start

Cheek filler is a procedure that restores the natural volume of cheeks that have thinned and sagged over time, filling in the sunken areas. The most widely used type is hyaluronic acid (HA) filler, and depending on the situation, PLLA, PCL, or CaHA-based fillers that induce collagen production may also be selected. The key is to first distinguish 'why they have sunken' rather than 'what to fill.' If it is a simple lack of volume, fillers work well, but if skin sagging or fat descent is the cause, a lifting approach may be more necessary.

The cheek is an area where blood vessels and fat layers are intricately intertwined, so your impression can change completely depending on how you set the amount and location of the injection. Therefore, rather than injecting a lot from the beginning, starting with a small amount and adjusting naturally is safer. We will summarize everything below, from the differences between ingredients to maintenance periods and safety rules.

🔍 Sunken Cheeks, Why You Must First Distinguish the Cause

Even with the same 'sunken cheeks,' the causes are different. Typical examples include a reduction in fat and collagen due to aging, loss of cheek fat due to rapid weight loss, and cases where the entire cheek has sagged due to stretched skin and ligaments.

If a lack of volume is the cause, filling it with filler is effective, but if sagging is the primary cause, filler alone has its limitations. Rather, the added weight can make it look more sagged. In such cases, it is more natural to consider elasticity treatments such as thread lifting or ultrasound/high-frequency therapies together.

The primary target of sunken cheeks is mid-face volume. When this area is revived, nasolabial folds (smile lines), the under-eye area, and even marionette lines are often subtly softened together. Therefore, rather than looking at the cheeks in isolation, approaching the face as a whole structure yields better results.

📌 Key Summary: You must first determine whether the sunkenness is due to a lack of volume or sagging. If sagging is the cause, combining it with lifting may be necessary.

💉 Types of Cheek Filler, How Do They Differ?

Fillers are broadly divided into hyaluronic acid-based types and collagen-inducing types. Each has distinct characteristics, so the choice depends on your goal.

The reason HA fillers are used the most is that they can be dissolved with an enzyme called hyaluronidase if the result is unsatisfying or if side effects occur. Having a high potential for correction is a major advantage for both beginners and cautious individuals.

The PLLA and PCL lines slowly produce one's own collagen over several weeks to months, rather than providing immediate volume. Instead of filling up naturally, it can feel frustrating for those who want to see immediate results. Most products contain lidocaine to reduce pain, making the procedure less uncomfortable.

📌 Key Summary: HA is dissolvable and thus advantageous for correction, whereas collagen-inducing fillers last longer but lack immediate effects and are difficult to remove.

⏱️ What Is the Maintenance Period and the Procedure Process?

The maintenance period for HA fillers is usually 6 to 18 months. However, there are large variations depending on an individual's metabolic rate, amount of exercise, facial expression usage, and the layer into which it is injected. CaHA is expected to last 12 to 18 months or more, and PLLA/PCL is expected to last around 2 years.

The procedure itself takes about 10 to 30 minutes, and the time to apply anesthetic cream (20 to 30 minutes) is required separately. Recovery is mostly immediate, allowing daily life on the same day, but swelling or bruising subsides within 3 days to 2 weeks, and it takes about 2 to 4 weeks for the filler to completely settle.

The injection volume generally ranges from 1 to 4cc combined for both sides. However, because individual differences are large depending on the degree of sunkenness, facial structure, and goals, it is better to decide during consultation rather than obsessing over a specific 'cc' number.

📌 Key Summary: The HA maintenance period is 6–18 months, the procedure takes 10–30 minutes, settling takes 2–4 weeks, and the injection volume is usually around 1–4cc for both sides.

⚠️ Side Effects and Safety, Things You Must Not Miss

The most crucial thing to be careful of with fillers is vascular occlusion. Blood vessels such as the facial artery and infraorbital artery pass around the cheeks, and if the filler blocks them, it can rarely lead to skin necrosis or blindness. Though it is not common, this is why choosing experienced medical staff with a deep understanding of anatomy is important.

If any of the following symptoms occur, you should contact the clinic without delay.

• Severe pain at the injection site

• The skin turning pale or showing a purple net-like discoloration

• Coldness or abnormal sensation in the skin

• Sudden blurred vision, double vision, or decreased vision

Using a round-tipped cannula (blunt needle) instead of a sharp needle can reduce the risk of blood vessel damage, so the choice is made depending on the area. It is also basic practice to verify whether the filler being used is an authentic product approved by the Ministry of Food and Drug Safety (MFDS).

Over-injection is another issue. If you greedily inject too much, your face can look larger or your cheeks can clump when you smile, resulting in a so-called 'pillow face'. It is much safer to inject a bit less at first, observe the condition after 2 to 4 weeks, and then perform a touch-up.

📌 Key Summary: Knowing the signs of vascular occlusion (paleness, discoloration, vision abnormalities) and lowering risks through authentic product usage and small-step injections is the key.

📋 Before and After the Procedure, Check These Points

If you are taking aspirin, omega-3, high-dose vitamin E, or anticoagulants before the procedure, consult with your doctor to decide whether to stop. This is a measure to help reduce bruising. If you are pregnant, breastfeeding, have a keloid constitution, or an autoimmune disease, you must be more cautious about the procedure.

It is recommended to avoid alcohol, saunas, and strenuous exercise for at least 24 to 48 hours after the procedure, and not to massage or press hard on the treated area. Giving stimulation before the filler settles can warp its shape.

One practical tip: keeping a record of the product name and volume injected will make it much easier to respond if you get a re-treatment later or if issues arise.

📌 Key Summary: Adjust anticoagulant medications after prior consultation, avoid stimulation for two days after the procedure, and keep a record of product information.

🌿 Filler vs. Other Treatments, How Do They Compare?

Fillers are not the only solution for sunken cheeks. Autologous fat grafting has the advantage of being semi-permanent, but it has a long downtime and its engraftment rate is difficult to predict. If there is also sagging, lifting is needed more than volume, so thread lifting might be a better fit.

The important thing is a structural approach that looks at both sunkenness and sagging, rather than insisting on a single procedure. It is more natural to combine treatments, such as filling areas that need volume with fillers and holding up sagging areas with elasticity treatments.

For reference, in a survey, 61% of consumers chose 'safety' as the most important factor when receiving filler treatments. This shows that the awareness of prioritizing a safe approach over spectacular results is widely established.

The cost varies greatly, from about 80,000 KRW per 1cc for domestic fillers to over 400,000–600,000 KRW per 1cc for imported fillers. The total amount changes depending on the clinic, the practitioner's skill level, and the required volume, so it is difficult to judge based solely on unit price.

📌 Key Summary: Fillers, fat grafting, and lifting have different purposes, and a structural approach that addresses both sunkenness and sagging creates natural results.

💬 How Onlif Views Cheek Volume

Gangnam Onlif Clinic focuses on non-surgical procedures from a skin-centric perspective—such as fillers, skin boosters, thread lifts, ultrasound HIFU, and high-frequency RF—rather than incisional surgeries that require a scalpel. The same applies to sunken cheeks. Rather than overfilling, we prioritize restoring only the sunken areas naturally while preserving your original look.

Based on the belief that one person cannot be excellent at everything, Onlif divides and assigns procedures by field to those who excel in them. Since cheek volume is an area that must be handled within the overall balance of the face, much like nasolabial fold fillers, we believe that diagnosis and design determine the outcome. With an attitude of 'We do not change you,' we aim for natural, non-excessive improvement.

❓ Frequently Asked Questions (FAQ)

Can I dissolve it if I don't like it?

Hyaluronic acid (HA) fillers can be dissolved with an enzyme injection called hyaluronidase, making correction possible. On the other hand, because CaHA, PLLA, and PCL lines are difficult to dissolve, HA fillers are advantageous if reversibility is important to you.

How many cc are needed for sunken cheek filler?

Usually, the procedure is done within the range of 1 to 4cc combined for both sides, but individual differences are significant depending on the degree of sunkenness and facial structure. It is safer to start slightly conservatively rather than injecting a lot at once, and then supplement with a touch-up after 2 to 4 weeks.

Can getting cheek filler make my face look bigger?

If over-injected, your face can look larger, or you could get a 'pillow face' where the cheeks clump when you smile. You can reduce this risk by injecting small amounts step by step.

How long does it last?

HA fillers last about 6 to 18 months, CaHA lasts over 12 to 18 months, and the PLLA/PCL lines last around 2 years. There are large variations depending on metabolism speed, exercise amount, expression usage, and the injected layer.

If cheek sunkenness is due to skin sagging, can it be solved with filler?

If sagging is the primary cause, fillers alone have limitations, and the added weight can actually make it worse. In this case, combining thread lifting or elasticity treatments is more natural.

What symptoms require an immediate visit to the clinic after the procedure?

Extreme pain, skin turning pale or a purple net-like discoloration, coldness/abnormal sensations, or sudden blurred vision/vision loss are signs that suggest vascular occlusion. If you experience these symptoms, you must contact the clinic without delay.

Good results for sunken cheeks begin with accurately identifying the cause. Since the right answer for ingredients, volume, and location varies for each person, we recommend confirming with a precise diagnosis through consultation.