Why skin gets oilier in a Seoul summer

Seoul summers are hot and humid, with a rainy season (jangma) usually arriving around late June and lasting into July, followed by steamy days in August. Higher temperatures increase sweat and make sebum flow more easily across the skin surface, so the face looks shinier. Humidity keeps that mixture of oil, sweat and sunscreen sitting on the skin, and a mask, hair or a phone screen pressing against it adds friction.

The result is the summer pattern many people know: a shiny T-zone by midday, blackheads on the nose and chin, small bumps after a day out, and pores that look larger than in winter. Pores do not truly open and close, but when they are filled with oil and debris, and the surrounding skin is less firm, they look bigger.

Understanding this helps avoid the common mistake of attacking oil aggressively. Our large pores guide explains why pores look bigger and what actually changes their appearance.

Is it just oiliness, or something else?

Shiny skin with blackheads is common and usually harmless, but several other conditions are often mistaken for simple oiliness. Rosacea causes redness, flushing and small bumps, and gets worse with heat and harsh products. Fungal folliculitis (sometimes called fungal acne) produces itchy, similar-sized bumps on the forehead, chest and back, and tends to flare in hot, humid weather; it needs antifungal rather than standard acne treatment.

Deep, painful cysts or acne that leaves scars need medical treatment early to prevent permanent marks. And sudden adult acne with irregular periods or new hair growth may be hormonal; our article on hormonal acne treatment while visiting Korea explains the next steps.

Clinic treatments for oil, pores and congestion

Medical extraction by trained staff removes blackheads and closed comedones with sterile tools and appropriate pressure, reducing the risk of marks compared with squeezing at home. It is often combined with a gentle chemical peel, such as salicylic acid, which dissolves oil inside pores. Our article on acne extraction by medical professionals explains what to expect.

For pores that look enlarged, fractional and picosecond treatments such as Pico Fraxel create tiny treatment zones that stimulate collagen around the pores and improve texture over several sessions. They usually cause a few days of redness and need good sun protection.

Some Korean clinics offer intradermal toxin (often called skin Botox) for oily skin, where very diluted botulinum toxin is placed superficially. Small studies suggest it can temporarily reduce oil and the look of pores in some people, but results vary, last a few months, and the evidence base is still limited. A doctor will discuss whether it is reasonable for you; see our skin Botox versus regular Botox article.

When the shine comes with breakouts

Oily skin and acne often go together, because sebum feeds the bacteria involved in inflamed spots and plugs the follicle. If you have frequent red or pus-filled spots, oil control alone is not enough. Medical acne treatment may include topical retinoids, benzoyl peroxide or antibiotics, and in more persistent cases oral medicines prescribed by a doctor.

In clinic, calming light or laser, careful extraction, and small injections for painful cysts can settle flares, while regenerative treatments such as LDM can help calm reactive skin. Once active acne is under control, marks and scars can be addressed. Our acne and breakouts guide covers the options.

• Acne & Breakouts
• Large Pores
• Pico Fraxel
• Rainy Season Acne Prevention

Home care that actually works in humidity

Dermatologists recommend washing oily skin twice a day and after sweating, with a gentle foaming or gel cleanser and lukewarm water, then using oil-free, non-comedogenic products. The American Academy of Dermatology also suggests blotting papers through the day rather than repeated washing, and choosing products labelled oil-free or non-comedogenic.

Moisturiser still matters. Oily skin can be dehydrated, especially after acne treatments or air-conditioning, and dehydration can make skin feel tight while still looking shiny. A light gel moisturiser keeps the barrier healthy without adding grease.

• Cleanse morning and night, and after heavy sweating; avoid scrubbing.
• Use a light, non-comedogenic sunscreen and reapply on long days out.
• Carry blotting papers instead of re-washing during the day.
• Choose gel or fluid textures; avoid heavy creams and oils on the face.
• Change pillowcases often and clean phone screens and masks.

A realistic summer timeline

Oil control is a management plan rather than a cure. Extraction and peels give a visible improvement within days, while pore and texture treatments take several sessions over two to three months. Intradermal toxin, when used, typically starts working within one to two weeks and wears off after a few months.

Because summer UV is strong, we keep lasers gentle and prioritise treatments with little downtime during the hottest months, saving more intensive resurfacing for autumn. Our autumn skin repair article covers the next step.

Visiting Seoul in summer

If you are visiting Seoul in summer, expect heat, humidity and heavy rain on some days. Plan clinic visits for the cooler morning hours if you can, carry sunscreen and blotting papers, and avoid saunas and very hot baths for a day or two after peels or lasers.

The clinic is between Myeongdong and Jongno, about six minutes' walk from Jongno 3-ga and Euljiro 3-ga stations, and our English-speaking team can advise on WhatsApp before you arrive. See the English-speaking clinic guide for how we work with visitors.

Frequently asked questions

Related treatments and guides

Keep reading

• Rainy Season Acne Prevention
• Acne Extraction by Medical Professionals
• Skin Botox vs Regular Botox in Seoul
• Acne Facial for Travelers in Seoul
• Men's Acne Solutions in Seoul

Sources

1. American Academy of Dermatology – How to control oily skin
2. American Academy of Dermatology – What can treat large facial pores?
3. Enlarged Facial Pores: An Update on Treatments – Cutis (2016), MDedge
4. DermNet – Acne vulgaris: features, types and treatments