Sunken Cheek Fillers: Essential Things to Know Before You Start

Cheek filler is a procedure that fills in the volume of cheeks that have thinned and sagged due to aging, naturally restoring 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 became sunken' rather than 'what to fill them with.' If it is a simple lack of volume, fillers work well, but if sagging skin or descending fat is the cause, a lifting approach may be more necessary.

The cheek is an area where blood vessels and fat layers are complexly intertwined in the face, so your impression can change completely depending on how the injection volume and location are determined. Therefore, rather than injecting a lot from the beginning, starting with a small amount and adjusting it naturally is a safer approach. Below, we will break down everything from the differences by ingredient to the duration of effects and safety guidelines.

🔍 Sunken Cheeks: Why You Must First Distinguish the Cause

Even for the same 'sunken cheeks,' the causes differ. Typical cases include when fat and collagen decrease due to aging, when cheek fat is lost due to rapid weight loss, and when the entire cheek sags downward because of stretched skin and ligaments.

If the cause is a lack of volume, filling it with filler is effective, but if sagging is the primary cause, filler alone has its limits. On the contrary, it can add weight and make the cheeks look even more saggy. In this case, it is more natural to consider combining skin elasticity procedures such as thread lifting, ultrasound, or radiofrequency.

The primary target for sunken cheeks is mid-face volume. When this area is revived, the nasolabial folds, under-eye areas, and marionette lines are often subtly softened together. Therefore, rather than looking at the cheek in isolation, approaching it from the overall facial structure yields better results.

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

💉 Types of Cheek Fillers: How Are They Different?

Fillers are largely divided into hyaluronic acid-based fillers and collagen-inducing fillers. Each has distinct characteristics, so the choice depends on your goals.

The reason HA fillers are most widely used is that if you do not like the results or if side effects occur, they can be dissolved with an enzyme called hyaluronidase. High reversibility is a huge advantage for both beginners and cautious individuals.

PLLA and PCL-based fillers do not provide immediate volume but instead gradually produce your own collagen over several weeks to months. While they fill in naturally, it can be frustrating for those who want to see results immediately. Most products contain lidocaine to reduce pain, making the procedure less uncomfortable.

📌 Key Summary: HA is easy to correct because it can be dissolved, while collagen-inducing fillers last longer but have no immediate effect and are difficult to remove.

⏱️ What is the Duration and the Treatment Process?

The duration of HA fillers is typically 6 to 18 months. However, there are significant variations depending on individual metabolism speed, exercise levels, facial expressions, and the layer into which they are 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 additional time is required for applying numbing cream (20 to 30 minutes). Recovery usually allows for normal daily activities 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 a consultation rather than obsessing over a specific 'cc' number.

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

⚠️ Side Effects and Safety: What You Must Not Overlook

The most critical concern 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. Although this is uncommon, it is why choosing an experienced medical team with a deep understanding of anatomy is crucial.

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

• Severe pain in the treated area

• Skin turning pale or showing a purple net-like discoloration

• Cold skin temperature or abnormal sensations

• 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 based on the target area. Additionally, verifying that the filler being used is an authentic product approved by the Ministry of Food and Drug Safety (MFDS) is essential.

Over-injection is another issue. If you greedily inject too much, your face can look larger, or you may end up with a so-called 'pillow face,' where the cheeks clump up when you smile. It is much safer to under-inject slightly at first and touch it up after 2 to 4 weeks while observing the results.

📌 Key Summary: It is crucial to recognize the signs of vascular occlusion (pale skin, discoloration, vision changes) and to lower risks by using authentic products and injecting small amounts gradually.

📋 Checklist Before and After the Procedure

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

For at least 24 to 48 hours after the procedure, avoid alcohol, saunas, and strenuous exercise, and refrain from massaging or pressing hard on the treated area. Applying stimulation before the filler settles can warp its shape.

A practical tip: keeping a record of the product name and volume used will make it much easier to address any future touch-ups or issues.

📌 Key Summary: Adjust anticoagulant medications after prior consultation, avoid stimulating the area for two days after the procedure, and record the product details.

🌿 Filler vs. Other Procedures: 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 hard to predict. If sagging is also present, lifting is needed more than volume, so thread lifting might be a better fit.

What is important is a structural approach that addresses both sunkenness and sagging rather than insisting on a single procedure. It is more natural to combine treatments, such as filling areas that lack volume with fillers and lifting sagging areas with skin elasticity procedures.

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 safety coming before glamorous results is widely established.

The cost varies significantly, starting from around 80,000 KRW per 1cc for domestic fillers, while imported fillers cost upwards of 400,000 to 600,000 KRW per 1cc. Since the total cost varies depending on the clinic, the practitioner's skill level, and the required volume, it is difficult to judge by the unit price alone.

📌 Key Summary: Fillers, fat grafting, and lifting serve different purposes. A structural approach that addresses both sunkenness and sagging leads to natural results.

💬 How Onlif Views Cheek Volume

Gangnam Onlif Clinic focuses on non-surgical skin procedures—such as fillers, skin boosters, thread lifts, ultrasound HIFU, and radiofrequency RF—rather than incisional surgeries. The same goes for sunken cheeks. Rather than over-filling, we prioritize naturally restoring only the sunken areas while preserving your original impression.

Believing that one person cannot excel at everything, Onlif divides and assigns procedures based on fields of expertise. Since cheek volume, like nasolabial fold fillers, is an area that must be handled within the overall balance of the face, we believe that diagnosis and design determine the results. With the philosophy 'We do not change who you are,' we aim for natural, non-excessive improvements.

❓ Frequently Asked Questions (FAQ)

Can it be dissolved if I do not like it?

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

How many cc of cheek filler is needed?

Usually, the procedure is performed 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 with a slightly smaller amount and touch it up after 2 to 4 weeks rather than injecting a lot from the beginning.

Can receiving cheek filler make my face look larger?

If over-injected, your face can look larger, or you may get a 'pillow face' where the cheeks clump up when smiling. Injecting small amounts progressively can reduce this risk.

How long does it last?

HA fillers last about 6 to 18 months, CaHA lasts 12 to 18 months or more, and PLLA/PCL-based fillers last around 2 years. There are significant variations depending on metabolism speed, exercise level, facial expressions, and the layer injected.

If my sunken cheeks are due to sagging skin, can filler resolve it?

If sagging is the primary cause, filler alone has its limits and may even add weight. In this case, combining thread lifting or skin elasticity procedures is more natural.

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

Severe pain, pale skin or purple net-like discoloration, cold skin/numbness, and sudden blurred vision or vision loss are warning signs of vascular occlusion. If you experience these symptoms, you must contact the hospital without delay.

Good results for sunken cheeks begin with accurately identifying the cause. Since the optimal ingredients, volume, and injection points differ for everyone, we recommend getting an accurate diagnosis through a consultation.

Things to Check Before Choosing a Clinic for Cheek Fillers

Even for the same procedure, the results and recovery process can vary depending on where, by whom, and how it is performed.

Asking the following questions during your consultation can help you make an informed decision:

• Is this a procedure they perform frequently? — Every clinic has different core areas of focus. Check if they regularly perform cheek filler procedures.

• Can I verify the products and equipment used? — Ask if you can verify the product name and authenticity (whether it is an approved import product and if there is an unboxing verification process) during the consultation.

• Do they explain the cost breakdown? — Rather than just hearing the total amount, you need to understand what product is used, how much, and on which areas to make a sound judgment.

• Do they design with the whole face in mind? — Even for the same procedure, the injection points and volume vary depending on your face shape, skin condition, and facial asymmetry.

• Do they explain the side effects and recovery process first? — A clinic that informs you of potential adverse reactions and how to handle them, rather than just promising desirable changes, is better for making a decision.

• Is there a post-procedure follow-up channel? — Check if the follow-up schedule, ways to contact them in case of anomalies, and criteria for follow-up visits are established.

How Onlif Clinic Performs Cheek Filler Procedures

• We divide responsibilities — Operating under the belief that a single doctor cannot handle all procedures, Onlif divides medical treatments among doctors specializing in each field.

• We verify products and equipment together during the consultation — We guide you through the product details and the unboxing verification process during the consultation.

• We explain the cost breakdown after the diagnosis — Because the target area, volume, and range differ for each individual, we explain what is being charged and why.

• We design based on overall facial balance — We view the face through three pillars: texture, balance, and youthfulness. We plan to refine areas that overshadow your natural look rather than changing your overall facial structure.

• We explain side effects and recovery first — We provide guidance on individual variations, potential side effects, and precautions alongside the expected changes before the procedure.

• We monitor progress post-procedure — We guide you on follow-up visits and contact channels if verification is needed during the recovery period.

If you are considering cheek fillers, it is best to first understand what is achievable and what is challenging given your current condition.

An accurate diagnosis and treatment plan can only be determined through an in-person consultation. Consult with Gangnam Onlif Clinic today.