The short answer: A Korean scrub, a warm soak followed by firm scrubbing with a rough towel, removes the outermost layer of dead skin and leaves skin noticeably smooth for a few days. Studies from Korea show a single scrub temporarily weakens the skin barrier, which recovers within days, while frequent, long-term rough-towel scrubbing is linked to dryness and, in some people, friction-related dark patches. For rough bumps like keratosis pilaris, it’s a short-lived fix; gentle chemical exfoliation and daily moisturizing do more between scrubs.
The scrub is one of the most recognizable parts of Korean bathing culture. Korean dermatology researchers described it as a custom unique to Korea: soaking in warm water, then scrubbing off the stratum corneum (the skin’s outermost layer) with a rough towel (Huh et al., 2002). Anyone who has had one knows the result: skin that feels astonishingly smooth.
For people with rough, bumpy body skin, that raises an obvious question. If one scrub works so well for a few days, why not do it often? This article looks only at what the scrub does to skin texture and the skin barrier, and where its limits are.
In this article
What a Korean scrub actually does
The method has two parts. A warm soak softens and hydrates the outer skin layer, then a rough, textured towel (often called an Italy towel) is rubbed over the skin with steady pressure. The goal is to remove the outer layer of dead cells, which is what you see rolling away during the scrub.
That outer layer, the stratum corneum, is also the skin’s main barrier against water loss. Removing part of it creates instant smoothness, and also a short period during which skin loses water more easily. That trade-off is the heart of the question.
What research shows about the Korean scrub
The most direct evidence comes from a study published in Contact Dermatitis. Researchers soaked volunteers’ forearms in 36°C water for five minutes, then scrubbed sections with a rough towel 0, 5, 10 or 15 times (Huh et al., 2002). They found:
- After a single scrub: water-holding capacity dropped for the first six hours, then rose, before returning toward normal from about day 3. Water loss through the skin peaked on day 2 and then declined.
- With repeated scrubbing over time: water-holding capacity and barrier function showed no lasting change, but the skin’s turnover time (how long it takes the outer layer to renew) became significantly shorter.
In other words, healthy skin bounced back from occasional scrubbing within a few days, and repeated scrubbing pushed the skin to renew itself faster. The authors noted that Korean dermatologists have advised against the practice, though with little data to support that advice.
A smaller study in the Asian Journal of Beauty and Cosmetology measured water loss on the shins of 20 women over eight weeks. Water loss rose from 6.8 to 13.4 g/h/m² in the group using an Italy towel and from 6.9 to 11.9 in the group using scrub cosmetics, while the group applying jojoba oil improved slightly (Kim, 2005). The study was small and the frequency of use isn’t clear from the abstract, but the direction matches common sense: frequent friction, without moisturizing, stresses the barrier.
Key takeaways
- A Korean scrub removes part of the skin’s outer layer, which is why the smoothness is dramatic.
- In healthy skin, barrier changes after a single scrub recover within a few days.
- Frequent rough-towel scrubbing is associated with dryness and, long term, friction-related dark patches.
- For keratosis pilaris and similar bumps, results are short-lived; gentle daily care does more.
Benefits and limits for rough, bumpy skin
Where it helps
For dry, flaky skin with a dull surface, an occasional scrub removes built-up dead cells and leaves skin softer. And the ritual itself has value: slowing down, soaking and caring for skin is part of why people love it.
Where it falls short
Keratosis pilaris. KP bumps are keratin plugs inside hair follicles. A scrub flattens the surface temporarily, but the plugs re-form, and friction can inflame the follicles. The NHS advises against harsh scrubs for KP because they can make it worse, while suggesting gentle scrubbing with a washcloth or mitt. That nuance matters: a 2026 randomized trial found that a gentle, fine-grain scrub used for 20 to 30 seconds, followed by a moisturizer, reduced KP bumps over 28 days about as much as a salicylic acid lotion (Liu et al., 2026). A vigorous bathhouse scrub is a different thing. We explain the distinction in why scrubbing makes KP worse.
Darker skin tones. The American Academy of Dermatology (AAD) advises avoiding strong mechanical exfoliation if you have a darker skin tone or dark spots, because aggressive exfoliation can increase pigmentation.
Friction marks. Long-term rubbing with rough towels and brushes is linked to two friction conditions. Dermatologists in Japan reported that macular amyloidosis (a buildup of amyloid protein in the skin) caused by prolonged friction from rough nylon towels or brushes is common in Asia, describing a case on the upper back that cleared after the towel was stopped, alongside treatment (Yoshida et al., 2009). Frictional melanosis, once called “towel melanosis,” causes dark patches over bony areas such as the spine (Holzer et al., 2021).
| Approach | What it does | Best use for rough skin | Main risk |
|---|---|---|---|
| Vigorous towel scrub | Removes part of the outer skin layer | Occasional reset for dry, flaky skin | Barrier stress, irritation, friction marks with frequent use |
| Gentle washcloth or fine scrub | Lightly lifts loose dead cells | Once or twice a week | Low if pressure stays light |
| Lactic acid or urea lotion | Loosens keratin and adds moisture | Most days, for KP and roughness | Mild stinging; AHAs raise sun sensitivity (FDA) |
| Plain moisturizer | Softens and supports the barrier | Daily, after every shower | Very low |
How to scrub smarter
If you love the bathhouse scrub, there’s no need to give it up. The research suggests that how often and how hard you scrub matters more than whether you scrub at all.
- Space it out. Give skin several days to recover between sessions. In the Korean study, barrier measures took about three days to normalize after a single scrub.
- Keep the soak warm, not hot. The AAD’s dry-skin advice is warm water and 5 to 10 minutes in the shower or bath (AAD).
- Use lighter pressure on bony areas. Friction marks have been reported over the spine and on the upper back.
- Skip inflamed or broken skin. The AAD advises never exfoliating cuts, wounds or sunburned skin. Avoid freshly shaved skin and active KP flares too.
- Moisturize right after. The AAD recommends applying moisturizer immediately after exfoliating. In the 2005 study, the oil-treated group was the only one whose water loss improved.
- Maintain between scrubs with gentle chemistry. A 2025 literature review concluded that the benefits of keratolytics such as lactic acid and urea for KP require ongoing use (Dampa, 2025). That steady, low-intensity care is the part a scrub can’t replace. See our guides to acids for body bumps and urea for keratosis pilaris.
When to see a dermatologist
Scrubbing-related problems are usually mild and fade when the friction stops, but some deserve a professional look. Our red-flag checklist covers bumps in general.
See a board-certified dermatologist if
- New dark or discolored patches develop on the upper back, shoulders or over the spine.
- Skin stays raw, red or stinging for days after a scrub.
- Bumps become painful, pus-filled or spread after scrubbing.
- Dark marks are building up where you scrub.
Frequently asked questions
How often should you do a Korean scrub?
There’s no official guideline. In the Korean forearm study, barrier measures took about three days to recover after a single scrub, so scrubbing more than once or twice a week leaves little recovery time. People with dry, sensitive or darker skin may do better with less frequent sessions.
Does a Korean scrub help keratosis pilaris?
It smooths the surface for a few days, but it doesn’t stop keratin plugs from re-forming, and vigorous scrubbing can inflame follicles. Daily moisturizing with urea or lactic acid, plus gentle physical exfoliation, is a better long-term approach.
What is the gray stuff that comes off during a Korean scrub?
It’s mostly dead skin cells from the outer layer of skin, which the scrub is designed to remove, softened by the warm soak. Seeing a lot of it doesn’t mean your skin was dirty.
Can a Korean scrub cause dark spots?
Long-term, repeated friction can. Frictional melanosis causes dark patches over bony areas, and macular amyloidosis linked to rough nylon towels has been reported as common in Asia. Lighter pressure and less frequent scrubbing reduce the risk.
Is an Italy towel safe for daily use?
Daily use isn’t advisable. In a small Korean study, eight weeks of Italy towel use was associated with nearly double the water loss through the skin. A soft washcloth is a better everyday tool.
Sources
- Huh CH, Seo KI, Kim SD, Han JH, Eun HC. “Biophysical changes after mechanical injury of the stratum corneum in normal skin.” Contact Dermatitis, 2002. source
- Kim SH. “A study on the effects of skin barrier damage on TEWL and the efficacy of jojoba oil in skin barrier restitution.” Asian Journal of Beauty and Cosmetology, 2005. source
- Yoshida A, Takahashi K, Tagami H, Akasaka T. “Lichen amyloidosis induced on the upper back by long-term friction with a nylon towel.” Journal of Dermatology, 2009. source
- Holzer D, Wanat K, Lalor L. “Frictional melanosis: a pediatric case series.” Pediatric Dermatology, 2021. source
- Liu F, et al. “An innovative formula for keratosis pilaris treatment: a randomized controlled study based on the ‘exfoliation-dissolution-repair’ concept.” Journal of Cosmetic Dermatology, 2026. source
- Dampa E. “The effectiveness of topical keratolytics (alpha hydroxy acids/beta hydroxy acids/urea) in treating keratosis pilaris: a review of the literature.” Cureus, 2025. source
- NHS. “Keratosis pilaris.” nhs.uk. source
- American Academy of Dermatology. “How to safely exfoliate at home.” AAD.org. source
- American Academy of Dermatology. “Dermatologists’ top tips for relieving dry skin.” AAD.org. source
- U.S. Food and Drug Administration. “Alpha hydroxy acids.” FDA.gov. source
This article is for general information and isn’t a substitute for professional medical advice, diagnosis or treatment.