Korean Acne Skin Care: What Experts Say About Cleansing and Ingredients

How to Cleanse Oily, Acne-Prone Skin Without Making It Worse

Before touching your face, a Korean cosmetic scientist recommends washing your hands thoroughly with soap to reduce the amount of bacteria transferred to your skin during cleansing.

Soaking the face well with water before applying any cleanser is also worthwhile: the skin swells slightly when wet, which helps dislodge sebum and impurities more effectively.

Rather than applying cleanser directly to the face, lathering it in your hands first creates a cushion of foam that limits friction and lowers the chance of irritating the skin.

Once the cleanser is on the face, the same cosmetic scientist advises massaging it in for around 30 seconds — enough to clean without compromising the skin barrier.

Rinsing is where many routines fall short. Spending roughly two minutes washing away all cleanser residue is the target, with particular attention to the hairline, ears, and the area under the chin, where incomplete rinsing is a leading cause of breakouts.

After cleansing, facial towels should be swapped out frequently — ideally daily — to prevent bacteria from building up on damp fabric and ending up back on clean skin.

On the question of cleanser pH, the cosmetic scientist notes that sebum and oil naturally form a protective lipid film on the skin's surface that keeps moisture in and harmful bacteria and viruses out, but that same sebum can clog pores and create an environment where acne-causing bacteria thrive when it accumulates in excess.

Mildly acidic cleansers are gentler but offer lower cleansing power, which can make it hard for people with very oily skin to clear away a full day's worth of sebum, oil, and dead skin cells.

For that reason, people with very oily skin who wake up with a noticeably greasy face may find mildly alkaline cleansers appropriate for both morning and evening use, while the broader recommendation for oily, acne-prone skin is to alternate between mildly alkaline and mildly acidic formulas depending on how the skin feels.

One practical note: using a mildly alkaline cleanser every single day can irritate the skin, so limiting it to once every two days is a sensible approach, and anyone with an existing skin condition should stick to slightly acidic cleansers instead.

A mildly acidic cleansing foam containing 0.5% salicylic acid is one option worth knowing about — it helps soften sebum and supports the removal of dead skin cells.

It is also worth noting that salicylic acid, a BHA, loses its effectiveness when it is formulated into a mildly alkaline cleanser, because the alkaline environment neutralizes its acidic properties.

Key Ingredients Korean Experts Recommend for Oily and Acne-Prone Skin

A Korean doctor points to niacinamide as a particularly useful ingredient for oily and acne-prone skin: it helps bring excess sebum production under control and has a calming effect on skin inflammation.

The same doctor highlights The Ordinary Niacinamide 10% + Zinc 1% as a combination that works well for oily skin, since both niacinamide and zinc independently support sebum regulation.

Squalane is another ingredient the doctor discusses in this context. Unlike squalene, squalane is a stabilized form of the molecule, and it may help reduce excess sebum by signaling to the skin that it already has enough — essentially reducing the drive to produce more.

For people concerned about acne, the doctor also recommends looking for products formulated with BHA, which can help address blemish-related concerns.

Retinol comes up as well: the doctor considers it important for oily skin because it works on two fronts, regulating excess sebum production and encouraging skin cell turnover. For anyone who finds retinol too irritating to tolerate, HPR is suggested as an alternative that delivers stronger results with less irritation.

A Korean pharmacist adds that niacinamide also helps keep sebum in check and has a soothing effect on the skin, reinforcing its value in routines built around oily or blemish-prone skin.

Madecassoside is another ingredient the pharmacist highlights, noting its role in supporting skin regeneration and calming irritation.

Ceramides and cholesterol are also mentioned as ingredients that help protect the skin barrier, which matters especially when actives like retinol or BHA are in the routine.

Spot Products: What a Korean Pharmacist Found in Daiso and Other Formulas

A Korean pharmacist reviewed several spot-focused products and found them worth discussing for people new to acne care or those cautious about irritation, noting that Daiso spot products in general are a reasonable starting point for beginners.

Daiso's A-Solution Asungcho Calamin Jinjung Cock Spot contains calamine, BHA, salicylic acid, and LAHA. The BHA concentration in Daiso A-Solution sits at 0.5%, which the pharmacist considers effective for a soothing function.

Daiso's Bi Od Td is a separate product with a different ingredient lineup: BHA, salicylic acid, LAHA, and tea tree or titanium dioxide.

Calamine, which appears in one of those formulas, helps calm and soothe the skin while also drying out blemishes. Because of how it works, the pharmacist advises dabbing it precisely onto specific troubled spots rather than spreading it across a wider area.

Picam Centella Trouble Spot is another product the pharmacist examined; it contains madecassoside, acid, and asiaticoside — ingredients associated with skin regeneration and calming irritation.

Morning Cleansing and the Role of pH for Oily Skin

A Korean doctor advises against simply rinsing with plain water in the morning, even for people who cleansed thoroughly the night before. Sebum and waste continue to accumulate on the skin overnight, and a slightly acidic cleanser in the morning helps address that buildup more effectively than water alone.

This recommendation applies specifically to oily skin types; the broader guidance from both the doctor and a Korean cosmetic scientist is that cleanser choice should be matched to skin condition rather than applied as a fixed rule for everyone.