Kerokan is a traditional Indonesian healing practice that involves repeatedly scraping the skin with a coin or other blunt object to relieve symptoms like body aches, chills, and fatigue. The skin is first coated with a lubricant, typically massage oil or balm, and then scraped in firm, repetitive strokes until reddish marks appear along the back, neck, or shoulders. It’s one of the most common home remedies across Indonesia and other parts of Southeast Asia, passed down through generations as a first-line response to feeling unwell.
How Kerokan Works
The technique is straightforward. Someone applies oil, balm, or lotion to the skin, then uses the edge of a coin (or another smooth, blunt-edged tool) to scrape the surface in one direction with moderate pressure. Strokes typically run along the back, neck, and sometimes the chest or limbs. The scraping continues until the skin turns visibly red or develops darker streaks, which practitioners interpret as a sign that the treatment is working.
In Indonesia, a regular metal coin is the standard tool. The Chinese version of the same practice, called gua sha, traditionally uses jade stones or specialized scrapers, but the underlying technique and effects are the same. The two practices share enough overlap that medical researchers treat them as regional variations of a single therapy.
The Connection to “Masuk Angin”
Kerokan is most closely tied to a cultural concept called “masuk angin,” which translates roughly to “wind entering the body.” Masuk angin isn’t a diagnosis you’d find in a Western medical textbook, but it describes a recognizable cluster of symptoms: bloating, mild nausea, muscle aches, fatigue, chills, and a general feeling of being run down. Think of it as what many Indonesians call the early stage of feeling sick, often after exposure to cold air, rain, or air conditioning.
In Javanese culture, kerokan is considered the primary remedy for masuk angin. The scraping generates a warming effect on the skin that is believed to release the trapped “wind” and restore balance. Anthropologists at Universitas Gadjah Mada have noted that kerokan is not just a medical act but a communal and culturally significant ritual, often performed by a family member at home, reinforcing social bonds alongside physical relief.
What Happens in the Body
The redness that appears during kerokan isn’t just cosmetic. The repeated pressure of the coin edge against lubricated skin causes tiny capillaries beneath the surface to rupture slightly, producing subcutaneous microbleeding. This creates the characteristic red or purplish streaks, sometimes called petechiae or “sha” marks. While that sounds alarming, the process triggers a cascade of physiological responses that help explain why people feel better afterward.
The most well-documented effect is a significant boost in local blood flow. Research published in the journal Evidence-Based Complementary and Alternative Medicine found that blood perfusion volume in the scraped area roughly doubled compared to baseline levels, and this increase persisted for at least 90 minutes after treatment. The scraping stimulates nerves that cause blood vessels to relax and open, increasing the number of active capillaries in the area and promoting circulation to tissues that may have been stiff or sore.
This improved microcirculation helps explain the warming sensation and the relief from muscle aches. The localized increase in blood flow delivers more oxygen and nutrients to the tissue while clearing away metabolic waste products that contribute to soreness and stiffness.
The scraping also activates pain-related nerve fibers in the skin. The repeated scratching motion stimulates large-diameter sensory nerve receptors, which can temporarily override deeper pain signals. This is similar to the “gate control” theory of pain: the sensation from scraping competes with and partially blocks the transmission of ache-related signals from muscles and joints beneath the skin.
At a deeper biochemical level, the minor tissue stress caused by scraping appears to trigger the body’s production of a protective enzyme called heme oxygenase-1. This enzyme breaks down heme (a component of damaged red blood cells) into byproducts that have antioxidant and anti-inflammatory effects. One of those byproducts, carbon monoxide in trace amounts, helps dampen inflammatory responses by reducing the activity of immune cells that drive swelling and pain. The net result is a localized anti-inflammatory effect that develops in the hours following treatment.
What the Skin Marks Mean
The red or purple streaks left by kerokan are the most visually striking part of the practice, and they can look startling to someone unfamiliar with the tradition. The marks are essentially minor bruises caused by blood leaking from tiny capillaries into surrounding tissue. Their color can range from light pink to deep purple depending on how much pressure was applied and the individual’s skin sensitivity.
Practitioners sometimes interpret darker marks as a sign of more severe illness or “trapped wind,” though this correlation hasn’t been validated scientifically. The marks are not dangerous in themselves. They typically fade completely within two to five days as the body reabsorbs the leaked blood, similar to how a mild bruise heals.
Who Should Avoid Kerokan
Because kerokan intentionally causes capillary microbleeding, certain people should be cautious. Anyone taking blood-thinning medications faces a higher risk of excessive bruising or bleeding beneath the skin, since their blood doesn’t clot as easily. The same applies to people with bleeding disorders or very fragile skin.
Kerokan should not be performed over broken skin, sunburns, rashes, moles, or areas with active inflammation or infection. Applying firm, repeated pressure to compromised skin can worsen the condition or introduce bacteria. People with conditions that affect skin integrity, such as eczema or psoriasis in the area to be scraped, should also avoid the practice on affected areas.
For most healthy adults, kerokan performed with reasonable pressure and clean tools carries minimal risk beyond temporary soreness and visible marks. The main practical concern is overly aggressive scraping, which can cause unnecessary pain and prolonged bruising without additional benefit.
Kerokan vs. Gua Sha
If you’ve encountered gua sha in a wellness or skincare context, kerokan is its close relative. Both practices use the same core technique: repeated unidirectional strokes with a smooth, blunt-edged tool over lubricated skin. Medical reviewers consider the two methods identical in terms of technique and physiological impact.
The differences are mostly cultural and material. Indonesian kerokan typically uses a metal coin and focuses on treating body ailments like muscle pain and cold-like symptoms. Chinese gua sha traditionally uses jade or horn scrapers and has been adapted in recent years into a gentler facial skincare technique popular in Western wellness culture. When applied to the body with therapeutic intent, however, the two are essentially the same practice with different names.