[Dr. Bellevue Column 100.] Is Dual Toning Too Much for the Skin? The Truth Behind the Myth That Frequent Laser Treatments Thin the Skin

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Dual toning, using two lasers simultaneously in one day

Is it too much for the skin?

[Subtitle] — The truth behind the myth that frequent laser treatments thin the skin

“Can my sensitive skin withstand simultaneous laser treatments?”

Many people who visit dermatology clinics to treat melasma, blemishes, and hyperpigmentation already have a weakened skin barrier or skin that reddens easily. For those who have experienced a major skin reaction after improper home care or using cosmetics that did not suit them, the intense energy of dermatological devices can feel even more frightening.

In particular, when we explain in the consultation room that “using a Pico laser and a RevLite laser on the same day can create a synergistic effect,” many people feel concern before anticipation. It is an entirely reasonable question to wonder, “If even one treatment is stimulating, could irradiating with two lasers consecutively cause a burn or, instead, lead to side effects such as darker pigmentation?”

To give you the conclusion first, dual toning does not work by removing the skin or accumulating stimulation, so even people with sensitive skin can undergo it with reassurance. Today, we will look at the mechanism behind why simultaneous treatment with two lasers can actually reduce skin irritation. We will also examine the truth behind the myth that “frequent laser treatments make the skin thin.”

1. Controlling the pace of picoseconds and nanoseconds to prevent heat buildup

What is the biggest reason skin becomes irritated or remains red for a long time after a laser treatment? It is the excessive residual “heat energy” in the surrounding normal tissue. Without this factor, there would be little reason to worry about side effects or downtime caused by heat accumulation and damage.

1> Blocking thermal damage with the Pico laser

The Pico laser delivers light at the remarkable speed of one-trillionth of a second, or a picosecond. This is such a short period that there is not even enough time for heat to spread to the surrounding skin. Because it uses only pure “photo-mechanical shock waves” to break pigment particles into tiny pieces, it significantly reduces the risk of burns and post-treatment redness.

2> RevLite’s stable output

The RevLite used in combination also uses Top-Hat mode, in which the center and surrounding areas of the beam have uniform energy. This prevents energy from becoming excessively concentrated in a particular area and forming hot spots. Therefore, even when the two devices are layered on the same day, the total thermal stimulation applied to the skin’s surface can be controlled much more safely than with a single high-fluence laser.

※ This section includes a term that may be unfamiliar to the general public. A single-fluence laser refers to “concentrating a strong amount of energy and delivering it all at once with a bang!” It is like striking a large rock once, very hard, with a massive hammer to break it. The powerful force may break the rock effectively, but the impact can also cause the ground beneath it—the surrounding normal skin—to crack or leave significant shock, or thermal damage. Dual-layering lasers, as used at Bellevue, are more like tapping the desired areas lightly and quickly with a precision carving hammer. The rock, or pigment, is broken into equally small pieces, but the ground around it, or the skin barrier, experiences very little vibration or impact, making the process safer. In other words, the total thermal stimulation applied to the skin’s surface is controlled much more safely than with a powerful single-shot laser that also stimulates the surrounding tissue.

2. Reassuring care that minimizes pain and irritation

No matter how good a laser device is, patients may experience pain or a slight sensation of heat during the procedure, and it is natural to be concerned about this. However, most of today’s toning devices are designed to minimize stimulation in innovative ways. Unlike in the past, there are not many dermatological laser devices that are unbearably painful. This is also a good thing from the doctor’s perspective. When patients are in pain, the practitioner also finds the procedure difficult, and patients may repeatedly flinch, making the treatment process challenging and potentially making it difficult to provide sufficient treatment.

The Pico laser mentioned today uses ultrafast shock-wave technology, while the RevLite SI laser distributes energy uniformly. As a result, excessive heat does not accumulate on the skin’s surface. Pain and heat are controlled to a mild prickling sensation, and damage to the epidermal layer is prevented at the source, helping the skin remain comfortable even after treatment.

3. Non-invasive treatment that does not remove the skin — achieving zero downtime

Procedures that remove the skin’s surface or create wounds and scabs inevitably cause a long recovery period and skin hypersensitivity. However, RevLite and Pico laser toning preserve the epidermal barrier. This is because they leave the skin’s surface intact and allow only light energy to pass through, targeting melanin pigment within the skin. Immediately after treatment, there is generally no bruising, swelling, or scabbing apart from slight temporary erythema, or redness. Applying makeup or washing the face right away does not overburden the barrier, making this a safe treatment option for busy office workers who need to receive light care after work and return to daily life the next day as if nothing happened, as well as for people with sensitive skin.

One of the most common myths heard in dermatology clinics, and one of the points patients fear most, is the idea that “frequent laser treatments make the skin thin.” This statement is partly true and partly false. Let us also look at why people came to believe it and what scientific basis lies behind it.

1. Memories of older devices that actually “removed” the skin — ablative lasers

The biggest historical basis for this myth is the ablative lasers that were commonly used in the past. Older CO2 lasers and early Fraxel devices treated scars and deep wrinkles by actually removing or injuring the skin’s surface, or epidermis. After treatment, patients really did need to go through several weeks of recovery while the epidermal layer was thinner. Because the skin became extremely sensitive and red during this process, the belief that “laser treatments make the skin thin and sensitive” became deeply established among the public.

2. Inappropriate intensity and excessively short treatment intervals — heat accumulation

Even with the toning devices commonly used today, improper treatment can provide a basis for barrier damage. When laser energy is delivered to the skin, heat is generated. If excessively strong energy is repeatedly delivered at short intervals without giving the skin cells time to regenerate, excessive heat can accumulate inside the skin, causing thermal damage. As the stratum corneum and barrier of the epidermis, which protect the skin, break down, moisture is lost, and the skin may feel dry and thin. Before treatment, you must consider your skin’s regenerative capacity and choose an appropriate treatment interval.

3. The temporary reduction of swelling in the dermal layer

There is also a physiological reason that can make the skin seem thinner immediately after treatment. Skin tissue that had become somewhat thicker due to chronic inflammation or slight swelling may lose that swelling as inflammation subsides and lymphatic circulation is promoted through laser treatment. From the patient’s perspective, the skin may feel thinner, as if some volume has been lost, but this does not mean the barrier has been damaged; rather, the tissue has returned to a firm and more streamlined state.

“Today’s lasers are different!”

Modern pigment lasers, including picosecond and nanosecond devices, are non-invasive lasers that do not remove the skin’s surface. Instead, while fully protecting the outer skin, or epidermis, they stimulate collagen production in the dermal layer and can help fill the skin from within, making it appear thicker and firmer over time. In other words, when performed properly, laser treatment does not make the skin thinner and may instead help it become healthier and thicker.

In short, the statement that “frequent laser treatments make the skin thin” applies to cases in which imprecise, intense stimulation is repeated indiscriminately. Today, I introduced dual toning with RevLite and Pico lasers, which target only the pigment and break it apart like dust without overburdening the skin’s surface, and which can actually shorten the treatment period and reduce long-term skin irritation. Thank you!

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Bellevue Clinic

The Mark-Vu skin analysis examination can identify a variety of skin concerns at once, including skin texture, hyperpigmentation, pores, wrinkles, skin tone, dark circles, radiance, redness, melanin, sebum, and acne-causing bacteria that are difficult to detect with the naked eye.

At Bellevue, we scientifically analyze your skin based on these findings and determine the necessary treatments. Through detailed consultations, we will do our best to provide the treatment most effective for each patient.

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