Can You Gua Sha Too Hard?

A video has been going around of a woman being scraped with gua sha to drive out heat. Her skin turns deep red, the red starts to break into dots, and it looks as though he is beginning to bleed. A lot of people asked me whether that is how gua sha is supposed to look. Here is my answer.

Can you gua sha too hard?

You can, There is a lot of gua sha content out there right now, and gua sha is a legitimate modality. It is useful for many kinds of conditions, from beauty to musculoskeletal pain relief. The problem in that video is not the tool or the tradition. It is how far the practitioner kept going.

Gua sha means, roughly, scraping away sha. A smooth-edged tool, traditionally a ceramic spoon, a coin, a piece of horn or jade, is stroked along oiled skin in one direction. The pressure draws blood toward the surface and the skin flushes. In Chinese medicine, that flush is the point: what was held deep in the tissue is brought up to where the body can clear it.

Research has measured what happens. At the University Hospital of Essen in Germany, researchers used laser Doppler imaging on 11 healthy volunteers before and after a single gua sha treatment on the back. Blood flow at the treated area rose fourfold for the first 7.5 minutes and stayed significantly higher for the whole 25 minutes they measured. Every volunteer reported an immediate drop in muscle pain, both where they were treated and at a distant site.^[1]

That pain relief has held up in patients. In a randomized trial of 48 people with chronic neck pain, one gua sha treatment reduced neck pain severity after a week by 29.9 millimeters more on a 100-millimeter scale than a heat pad did, with better scores for pain on movement, disability and quality of life.^[2] A second trial randomized 50 people with chronic low back pain to two gua sha treatments or a waiting list; the gua sha group finished with lower pain intensity and better overall health status.^[3]

In another randomized trial, 56 people with Parkinson's disease and pain received either 12 sessions of gua sha or no added treatment. The gua sha group improved in pain severity, motor function, mood and sleep quality.^[4] If your neck is the problem, I wrote about the Chinese medicine view of it in Why Did I Wake Up With a Stiff Neck?.

So gua sha works. That is exactly why it is worth doing correctly. The way we approach the body inside Gut Brain Synchrony is the same: use the right amount of the right thing, and stop when the body tells you it has had enough.

What happens if you gua sha too hard?

When you see the little red blood vessels start to appear on the skin, that is called petechiae. It is a sign that the skin is being physically damaged by the procedure, and it is time for the practitioner to stop.

Petechiae are tiny pinpoint spots of blood that have escaped from the smallest vessels, the capillaries, into the skin. They do not fade when you press on them, because the blood is no longer inside a vessel. Dermatologists see the same thing from other kinds of pressure: a case report from Mahidol University in Bangkok describes how compressive forces cause dermal capillaries to rupture, producing exactly these non-blanching purple-red spots.^[5] Scraping is a compressive force dragged across the skin. When the dots appear, capillaries are giving way.

Why stop there? Because if you go too far, you can start to open up those little blood vessels and cause the patient to bleed. The red flush means circulation is moving. The dots mean vessels are breaking. Bleeding means the skin itself has been opened. Each step past the first is more damage, not more benefit.

Can gua sha cause scarring?

Yes. Scraping hard enough to make the skin bleed can damage it, including scarring. Plastic surgeons in the United Kingdom showed how this works in 113 volunteers. They made a single shallow scratch that ran from a superficial depth at one end to deep in the dermis at the other, then followed it for months. The shallow end healed with no visible mark after week 18. The deep end healed with a visible scar. The threshold was about 0.56 millimeters, about a third of the full thickness of the skin where they tested it.^[6] Skin forgives a light injury and keeps a record of a deep one.

Can gua sha cause infection?

There is a higher risk of infection once the skin is broken. Intact skin is one of the body's main defenses. It is the largest organ in the body, home to a diverse population of microorganisms, most of them harmless or even beneficial, and it is watched over by both the innate and the adaptive immune system.^[7] Once the surface is opened, that barrier is gone.

Researchers who study gua sha safety have made the same point: blood and other potentially infectious material can be drawn through the surface of the skin during scraping, which contaminates the tool and creates a risk of bloodborne pathogen exposure. They proposed hospital-standard safety protocols for exactly this reason.^[8] Dermatologists in Korea reported a healthy 35-year-old woman who developed painful nodules and pustules on her arms and legs from a mycobacterial skin infection after gua sha done for body contouring; she needed repeated drainage and antibiotics.^[9]

This is why I say: please always have medical procedures performed by a professional. A trained practitioner knows where the line is, works with clean tools, and stops when the skin says stop.

What is gua sha for, and why scrape for heat?

The person in that video was being scraped to drive out heat, and the idea behind it is old and sound. In Chinese medicine, sha describes heat and stagnant blood trapped just under the surface, the kind of congestion that shows up as a stiff neck, a heavy head, a summer fever or a body that feels hot and stuck. Scraping draws that congestion to the surface and gives the heat a way out. Physicians in the Qing dynasty wrote entire texts on sha disorders and how to treat them.

Modern research gives part of the mechanism. In a laboratory study, mice were scraped with a smooth spoon edge until the first petechiae or bruising appeared. Imaging over the following days showed rising expression of heme oxygenase-1, an enzyme that protects cells against oxidative stress, in multiple internal organs. The researchers interpret it as an antioxidant response to the hemoglobin products released under the skin.^[10] Notice where that procedure stopped: at the first signs of petechiae.

Heat that rises and flushes is also what many women feel in perimenopause. At the Nanjing University of Chinese Medicine, 80 women with perimenopausal syndrome were randomized to weekly 15-minute gua sha sessions plus their usual care, or usual care alone, for eight weeks. The gua sha group had a larger drop in symptoms on the Kupperman Index, with greater reductions in hot flashes and sweating, insomnia, nervousness, low mood, fatigue and headache, and a better menopause-specific quality of life.^[11]

These are real benefits, and none of them requires scraping someone until they bleed. The release happens as the color comes up. Once the vessels start breaking, the work is done.

Can gua sha damage your face?

It can if you use the same force you would see on a back, and that is why facial gua sha has to be the gentlest version of all. A high-frequency ultrasound study of 189 healthy adults in China mapped skin at 13 sites and found that the epidermis, the protective outer layer, is thinner on the face and trunk than on the limbs.^[12]

Done gently, facial gua sha does real work. In a randomized trial, 34 women aged 20 to 50 used either a facial roller or a gua sha tool for 10 minutes, five times a week, for eight weeks. Both groups showed measurable changes in facial contour, with reductions of 2.23 to 2.40 millimeters in the gua sha group, and the gua sha group's facial muscles became measurably less tense and stiff.^[13] No one in that trial needed to scrape until the skin broke to get those results.

The face responds to circulation, and you do not need to injure it to bring blood there. I explain how in Does Massaging Your Face Help With Wrinkles?.

How to gua sha safely at home

You can safely do gua sha yourself, but it must be done very, very gently. This is how I would have you do it.

Gua sha questions, answered

Is gua sha supposed to hurt?

Not the way you do it at home. Done very gently, gua sha should feel like a firm, warm massage. If it hurts, you are pressing hard enough to damage the skin, and you should ease off.

Is gua sha supposed to bruise?

No. Redness that fades is circulation. Little red dots are petechiae, a sign that the skin is being physically damaged, and the point to stop. Bruising and bleeding are past that point, with a higher risk of scarring and infection.

How often should you gua sha your face?

Gently and regularly. In the eight-week facial trial, women used a gua sha tool for 10 minutes, five times a week, and their facial contour and muscle tone changed measurably.^[13]

Gua sha is good medicine. Respect the red dots, and let the skin tell you when the work is done.

— Brehan Crawford, L.Ac.

References

1. Nielsen A, Knoblauch NT, Dobos GJ, Michalsen A, et al. The effect of Gua Sha treatment on the microcirculation of surface tissue: a pilot study in healthy subjects. Explore (NY). 2007;3(5):456-466. doi:10.1016/j.explore.2007.06.001
2. Braun M, Schwickert M, Nielsen A, et al. Effectiveness of traditional Chinese "gua sha" therapy in patients with chronic neck pain: a randomized controlled trial. Pain Med. 2011;12(3):362-369. doi:10.1111/j.1526-4637.2011.01053.x
3. Saha FJ, Brummer G, Lauche R, et al. Gua Sha therapy for chronic low back pain: a randomized controlled trial. Complement Ther Clin Pract. 2019;34:64-69. doi:10.1016/j.ctcp.2018.11.002
4. Xu YC, Wang QQ, Chen MY, et al. The effect of Gua Sha therapy on pain in Parkinson's disease: a randomized controlled trial. Int J Gen Med. 2024;17:2791-2800. doi:10.2147/IJGM.S461958
5. Ploydaeng M, Jurairattanaporn N, Suchonwanit P, Rattananukrom T. Rumpel-Leede phenomenon associated with pneumatic compression: a case report. Clin Cosmet Investig Dermatol. 2022;15:2323-2327. doi:10.2147/CCID.S386426
6. Dunkin CSJ, Pleat JM, Gillespie PH, Tyler MPH, Roberts AHN, McGrouther DA. Scarring occurs at a critical depth of skin injury: precise measurement in a graduated dermal scratch in human volunteers. Plast Reconstr Surg. 2007;119(6):1722-1732. doi:10.1097/01.prs.0000258829.07399.f0
7. Grice EA, Segre JA. The skin microbiome. Nat Rev Microbiol. 2011;9(4):244-253. doi:10.1038/nrmicro2537
8. Nielsen A, Kligler B, Koll BS. Safety protocols for gua sha (press-stroking) and baguan (cupping). Complement Ther Med. 2012;20(5):340-344. doi:10.1016/j.ctim.2012.05.004
9. Park SW, Kwak HB, Lee SK, et al. Cutaneous infection caused by skin coining 'Gua Sha' in Korean healthy female. Ann Dermatol. 2021;33(6):572-576. doi:10.5021/ad.2021.33.6.572
10. Kwong KK, Kloetzer L, Wong KK, et al. Bioluminescence imaging of heme oxygenase-1 upregulation in the Gua Sha procedure. J Vis Exp. 2009;(30):1385. doi:10.3791/1385
11. Meng F, Duan PB, Zhu J, et al. Effect of Gua sha therapy on perimenopausal syndrome: a randomized controlled trial. Menopause. 2017;24(3):299-307. doi:10.1097/GME.0000000000000752
12. Wang S, Yu RX, Fan W, et al. Detection of skin thickness and density in healthy Chinese people by using high-frequency ultrasound. Skin Res Technol. 2023;29(1):e13219. doi:10.1111/srt.13219
13. Ahn SH, Hwang UJ, Han HS, et al. Comparative effects of facial roller and gua sha massage on facial contour, muscle tone, and skin elasticity: randomized controlled trial. J Cosmet Dermatol. 2025;24(6):e70236. doi:10.1111/jocd.70236