[Jamsil Gounsesang Dermatology] Skin Care Guide, from Basics to Advanced!

Skin Care Guide,

From Basics to Advanced!

Hello, this is Jamsil Gounsesang Dermatology!

These days, there is so much information about skin care that many people seem to feel even more confused. The internet is full of sensational ads like, “Use this product and you’ll see a difference in one day,” or “If it has this one ingredient, that’s all you need.”

But truly good skin care is not about flashy marketing or expensive products. The key is to understand your own skin accurately and consistently practice methods that are backed by scientific evidence.

Skin does not change overnight, but if you continue proper care, it can definitely transform into a healthy and beautiful state. Today, from the basic principles of skin care to specific methods you can apply right away in real life, we’ll organize and share information that is truly helpful.

Basics and Understanding of Skin Care

1. Characteristics by skin type and care points

Since everyone’s skin is different, accurately identifying your own skin type is the first step toward effective care.

Skin types are broadly divided into dry, oily, combination, and sensitive skin, and each has different characteristics and care methods.

Dry skin produces less sebum, so moisture evaporates easily. It tends to feel tight after cleansing, flake frequently, and develop fine lines early. For this type of skin, it is better to use a mild cream-type cleanser rather than a strong cleanser, and to choose products rich in hydrating ingredients such as ceramides and hyaluronic acid.

Oily skin produces sebum actively, so it tends to be very shiny, have enlarged pores, and develop acne or blackheads easily. However, even if you have oily skin, neglecting moisture can lead to even more oil production, so it is important to use a moisturizer with a light texture.

Combination skin often has an oily T-zone (forehead, nose, and chin) and a dry U-zone (cheeks). It is the most common skin type among Koreans, and different areas need different care.

Sensitive skin reacts easily to external stimuli and may show stinging, itching, or redness. For this type of skin, you should choose products with simple formulations and low irritation, and it is best to do a patch test whenever you use a new product.

Skin condition can also change depending on the season. In summer, higher humidity can make skin more oily, while in winter, dryness can make skin behave more like dry skin. So it is also a good strategy to adjust your products slightly by season.

2. Skin changes by age and customized care

As we age, our skin changes too, so it is important to know the right care methods for each age group. The changes skin goes through and the care it needs are different at each stage.

The teenage years and early 20s are periods when sebum production is active due to hormonal changes. Acne is the main concern, but this is also when the skin’s regenerative power is at its peak. During this period, it is better to focus on the basics rather than overdoing care. Simply cleansing gently with a mild cleanser and applying sunscreen carefully is enough.

From the mid-to-late 20s, collagen production gradually begins to decrease. You may not notice major changes yet, but this is a good time to start preventive anti-aging care. Try introducing ingredients like vitamin C or low-dose retinol.

In your 30s, fine lines around the eyes and mouth start to appear, and skin regeneration slows down. From this stage, more serious anti-aging care is needed. Pay more attention to moisturizing and actively use wrinkle- improving ingredients such as retinol or peptides.

In your 40s, the effects of hormonal changes become more pronounced. Especially for women, a decrease in estrogen can make the skin thinner and cause firmness to drop rapidly. At this time, care should focus on intensive hydration and improving elasticity.

After your 50s, the skin barrier function weakens significantly, and dryness and sensitivity become more severe. Rather than irritating ingredients, it is important to focus on strengthening the skin barrier and supplying moisture.

However, age is only a reference point. Since individual differences are large, the most important thing is to accurately understand your own skin condition and care for it accordingly.

Practical Skin Care Methods and How to Apply Them

1. Complete a basic skincare routine

The key to effective skin care is not using many complex products, but performing the basic steps accurately and consistently. It is best to approach this systematically by dividing the routine into morning and evening.

The morning routine should focus on removing the waste that has built up overnight and protecting the skin all day long. First, lightly cleanse with lukewarm water or use a mild cleanser. If you already cleansed thoroughly at night, washing with water only may be enough. Then use toner to balance the skin’s pH and provide moisture. It is less irritating to apply toner gently with your hands rather than with a cotton pad. If you have serum or essence, use it at this stage, and seal in moisture with a moisturizer. Finally, apply sunscreen carefully to complete the morning routine.

The evening routine should focus on removing pollutants and makeup accumulated throughout the day and helping the skin regenerate overnight. If you wore makeup, first remove it with a cleansing oil or balm, then do a second cleanse with a cleanser. This is called double cleansing, and it is an essential step for thorough cleansing. After cleansing, apply toner, serum, and moisturizer in that order. At night, you can use functional ingredients such as retinol or AHA/BHA. It is best to allow enough time for absorption between each step. Usually 30 seconds to 1 minute is enough, and if there is no sticky feeling when you apply the next product, you can consider it properly absorbed.

Above all, it is important to adjust the types and number of products according to your skin condition. On days when your skin is sensitive, reduce the steps; when your skin is in good condition, add functional products as needed.

2) How to use effective ingredients

Knowing the ingredients properly is very important in skin care. Even the same ingredient can have very different effects depending on concentration and how it is used.

First, hyaluronic acid is a powerful moisturizing ingredient that can attract moisture up to 1,000 times its own weight. Its effects vary depending on molecular size: low-molecular forms penetrate deeper to provide inner hydration, while high-molecular forms create a moisture barrier on the surface.

Ceramides are a major component of the skin barrier and are excellent for restoring a damaged barrier. They are especially essential for dry or sensitive skin.

Among anti-aging ingredients, retinol is the one with the strongest proven effectiveness. It promotes collagen production and speeds up cell turnover, making it effective for both wrinkles and pigmentation. However, it may cause irritation at first, so it is better to start with a low concentration of around 0.25–0.5% and gradually increase it.

Also, retinol is unstable in sunlight, so it should only be used at night, and sunscreen should be applied carefully the next day.

Vitamin C is a multitasker with both antioxidant and brightening effects. L-ascorbic acid is the most effective, but it can be irritating, so if you have sensitive skin, it is better to choose a stabilized form such as magnesium ascorbyl phosphate. AHA and BHA are exfoliating ingredients, and you should choose between them depending on your skin type. AHA (glycolic acid, lactic acid) is water-soluble and removes surface dead skin cells, while BHA (salicylic acid) is oil- soluble and removes dead skin cells and sebum inside the pores as well. BHA is more suitable for oily skin or acne- prone skin, while AHA is better for dry skin or skin with pigmentation concerns.

When combining ingredients, you need to consider compatibility. Retinol and AHA/BHA can be too irritating when used together, so it is better to use them on alternate days, and vitamin C and niacinamide may be less effective due to differences in pH, so it is better to use them with a time gap.

3. Integrating lifestyle habits into skin care

No matter how good your cosmetics are, if your lifestyle habits are poor, your skin will not improve. Skin health is directly connected to overall health.

The most basic thing is enough sleep. Skin regeneration mainly happens while you are asleep, and the golden time is especially from 10 p.m. to 2 a.m. During this time, you need to fall into deep sleep so that growth hormone can be actively secreted, damaged skin can recover, and new cells can be created. Lack of sleep increases cortisol, a stress hormone, which worsens skin inflammation and accelerates collagen breakdown.

Diet also has a direct effect on the skin. If you overconsume foods high in sugar, blood sugar rises rapidly, insulin secretion increases, and this can promote sebum production and worsen acne. Sugar also binds to collagen to form a substance called AGE, which speeds up skin aging. On the other hand, consistently eating foods rich in antioxidants such as berries, green and yellow vegetables, and nuts can neutralize free radicals and slow skin aging. Hydration is also important. You should drink at least 1.5–2 liters of water a day to maintain enough moisture in the body, which also keeps the skin hydrated.

Stress management is especially important in modern life. Chronic stress can cause hormonal imbalance and lead to various skin problems such as acne, pigmentation, and premature aging. Try to build habits that relieve stress through regular exercise, hobbies, meditation, yoga, and more.

Exercise improves circulation and helps supply nutrients and oxygen to the skin, but after exercising, you must shower to remove sweat and waste products.

Environmental factors also need attention. Keep indoor humidity at around 40–60%, change pillowcases and towels frequently, and regularly disinfect items you touch often, such as your smartphone and keyboard. These small habits can add up and make a big difference in skin health.

Skin needs consistent and continuous effort.

Skin care is like a marathon. Rather than expecting quick results like a sprint, steady and continuous effort is what matters most. Instead of being swayed by flashy marketing and trying everything, the real secret to effective skin care is to understand your own skin accurately and gradually practice methods backed by scientific evidence.

Above all, do not aim for perfect skin. Healthy and natural skin is the most beautiful skin. Accepting your skin type and condition while maintaining the best possible state within that is a realistic and sustainable goal. Skin care will not bring change overnight, but if you keep at it, you will definitely be able to see a difference.

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This article is provided by Jamsil Gounsesang Dermatology for the provision of medical information, in accordance with Article 56, Paragraph 1 of the Medical Service Act. All procedures/surgeries carry the risk of side effects such as bleeding, infection, and nerve damage, so please proceed carefully after sufficient consultation with the medical staff.