Dr.Park So Yoon Lectures on ULTRACOL at the 2026 Spring Congress of Aesthetic Laser Medicine

Advanced Under-Eye Rejuvenation with PDO Powder Filler and RF Cannula

A Dual-Layer Collagen Stimulation Approach for Dark Circles, Hollowness, and Skin Laxity

On April 12, 2026, Dr.Park So Yoon, Medical Director of Cheongdam Éclat de Clinic, delivered an academic lecture on ULTRACOL PDO Powder Filler at the Spring Congress of Aesthetic Laser Medicine, held at the newly opened COEX Magok in Seoul.

The lecture focused on one of the most delicate and highly requested areas in aesthetic medicine:
the under-eye region.

Under-eye dark circles and hollowness are often caused by multiple factors, including thin skin, vascular visibility, tear trough shadowing, skin laxity, and fine wrinkles. Because of this complexity, simply adding volume is not always the best solution.

Dr.Park introduced a refined approach using ULTRACOL 100 and ULTRACOL 200 with a dual-layer technique, combined with RF cannula to improve tissue quality, contour smoothness, and natural tightening.

Lecture Topic

How to Maximize the Effect of PDO Powder with RF Cannula
– RF Cannula for Under-Eye Dark Circles
– Introduction to the Dual Layer Technique of PDO Collagen Stimulator

The lecture was held at COEX Magok, a newly opened and spacious academic venue in Seoul.

This was Dr.Park’s first visit to COEX Magok, and the modern, bright, and comfortable venue created an inspiring atmosphere for academic exchange. During the congress, Dr.Park also visited the ULTRACOL booth and participated in a Polaroid event, capturing a warm moment from the busy academic day.

What Is ULTRACOL?

ULTRACOL is a PDO-based collagen stimulator.
PDO, or Polydioxanone, is a biodegradable material that has long been used in absorbable surgical sutures.

Unlike conventional fillers that mainly create immediate volume, ULTRACOL works by encouraging the skin to produce new collagen over time. This makes it especially valuable for patients who want a more natural, gradual, and regenerative improvement.

ULTRACOL is not simply a “filler.”
It is better understood as a collagen-stimulating treatment designed to improve skin quality, firmness, and subtle structural support.

Why PDO Powder Filler for the Under-Eye Area?

The under-eye area is one of the most sensitive regions of the face.
The skin is thin, the blood vessels may be visible, and even a small irregularity can be noticeable.

For this reason, Dr.Park emphasized that under-eye rejuvenation should not be approached as a simple volumizing procedure.

Instead, the treatment should consider:

• Skin thinness

• Fine wrinkles

• Tear trough hollowness

• Dark circles caused by shadowing

• Loss of elasticity

• Surface irregularity

• Risk of puffiness or overcorrection

ULTRACOL may be helpful because it supports gradual collagen regeneration rather than creating excessive volume at once.

Dual-Layer Technique with ULTRACOL 100 and 200

Dr.Park introduced a dual-layer approach using two types of ULTRACOL:

ULTRACOL 100

ULTRACOL 100 is mainly used for the more superficial layer.
It is suitable for improving:

• Fine lines

• Thin skin texture

• Crepey under-eye skin

• Dullness

• Superficial skin quality

ULTRACOL 200

ULTRACOL 200 is used for deeper structural support.
It is suitable for improving:

• Under-eye hollowness

• Tear trough shadow

• Structural depression

• Loss of support

• Natural volumizing through collagen stimulation

By combining both layers, Dr.Park aims to improve not only the appearance of dark circles but also the underlying tissue quality and structural support.

Why Combine RF Cannula?

In her lecture, Dr.Park also explained the role of RF cannula in under-eye rejuvenation.

RF cannula can be used as an adjunctive tool to:

• Improve tissue tightening

• Refine uneven texture

• Support smoother contouring

• Help organize delicate under-eye tissue

• Enhance the natural result of PDO collagen stimulation

For patients with under-eye dark circles caused by both hollowness and skin laxity, the combination of ULTRACOL + RF cannula may provide a more comprehensive and refined result.

Before & After Photo Section

Case 1: Under-Eye Dark Circles and Hollowness

Before and after ULTRACOL-based under-eye rejuvenation. Improvement in tear trough shadowing and overall brightness.

This case demonstrates how a collagen-stimulating approach can help soften under-eye hollowness and improve the tired appearance often caused by structural shadowing.

Case 2: Thin Under-Eye Skin and Fine Wrinkles

Improvement in under-eye texture, fine lines, and skin quality after ULTRACOL treatment.

Rather than simply filling the area, the goal is to improve the quality of the delicate under-eye skin over time.

Case 3: ULTRACOL with RF Cannula

Combination approach using ULTRACOL and RF cannula for smoother contour and natural tightening.

This combined technique may be considered for patients who need both collagen stimulation and tissue refinement.

Who Is a Good Candidate?

ULTRACOL under-eye rejuvenation may be suitable for patients who have:

• Under-eye dark circles

• Mild to moderate tear trough hollowness

• Thin or crepey under-eye skin

• Fine wrinkles around the lower eyelid

• Concerns about looking tired

• Hesitation about traditional filler due to puffiness or Tyndall effect

• Preference for natural, gradual improvement

• Limited stay in Korea and desire for non-surgical K-beauty treatment

Every patient is carefully evaluated by Dr.Park So Yoon to determine whether ULTRACOL, RF cannula, Eye Ultherapy, Eye Thermage, or other combination treatments would be most appropriate.

When Will Results Appear?

Because ULTRACOL works through collagen stimulation, results are generally gradual.

Patients may notice:

• Early subtle improvement within several weeks

• More visible collagen-related changes around 4–8 weeks

• Continued improvement over the following months

• More refined results with repeated sessions when needed

The exact timeline varies depending on skin condition, treatment depth, product selection, and individual collagen response.

Why Choose Cheongdam Éclat de Clinic?

Cheongdam Éclat de Clinic is known for highly personalized, premium aesthetic treatments in the heart of Cheongdam, Seoul.

Dr.Park So Yoon has extensive experience with collagen stimulators and has lectured at multiple academic societies on ULTRACOL, PDO powder filler, RF cannula, and complication-conscious treatment design.

At Cheongdam Éclat de Clinic, treatment is not standardized.
Each procedure is designed based on:

• Facial anatomy

• Skin thickness

• Under-eye structure

• Dark circle type

• Degree of hollowness

• Risk of swelling or irregularity

• Desired level of natural improvement

For international patients visiting Korea, this offers a refined medical K-beauty experience:
non-surgical, academic, personalized, and naturally elegant.

Post-Treatment Care

After ULTRACOL treatment, patients are generally advised to:

• Avoid strong massage unless instructed

• Avoid sauna, excessive heat, and intense exercise for several days

• Apply sunscreen carefully

• Keep the skin moisturized

• Avoid alcohol on the day of treatment

• Follow the clinic’s aftercare instructions

• Return for follow-up if swelling, firmness, or discomfort persists

Mild swelling, bruising, or temporary tenderness may occur and usually improves with time.

Possible Side Effects

As with all injectable procedures, possible side effects may include:

• Temporary swelling

• Bruising

• Tenderness

• Mild lumpiness

• Unevenness

• Delayed nodules in rare cases

• Inflammatory reaction in rare cases

Dr.Park emphasizes that the most important principle is not only how to manage side effects, but how to design the treatment from the beginning to reduce the chance of complications.

This includes precise layer selection, proper dilution, conservative injection volume, even distribution, and individualized treatment planning.

A Refined K-Beauty Approach for International Patients

Many international patients visiting Korea want visible improvement without surgery or a long recovery period.

ULTRACOL under-eye rejuvenation may be a meaningful option for those who want:

• Brighter-looking eyes

• Natural under-eye contour improvement

• Non-surgical dark circle treatment

• Minimal downtime

• Academic, doctor-led treatment planning

• A premium Cheongdam K-beauty experience

At Cheongdam Éclat de Clinic, Dr.Park So Yoon personally designs each treatment plan to create results that look refreshed, elegant, and natural.

Cheongdam Éclat de Clinic

Cheongdam Éclat de Clinic
4F, Cheongdam Square A-dong, 420 Dosan-daero, Gangnam-gu, Seoul, Korea
Tel. +82-2-6120-8888
Instagram @eclatde.usa

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