A doctor fish is a small freshwater fish, scientifically known as Garra rufa, that nibbles dead skin off the human body. Native to river systems across the Middle East, these fish became famous for their use in “fish pedicures” and skin therapy spas worldwide. They grow to a maximum of about 14 centimeters (roughly 5.5 inches), have a slender grayish-brown body, and use a specialized sucker-shaped mouth to scrape surfaces for food.
Where Doctor Fish Come From
Garra rufa are native to a wide stretch of the Middle East, found naturally in the Jordan, Tigris, and Euphrates river basins across Turkey, Syria, Iraq, Iran, and Jordan. They also inhabit smaller coastal rivers in southern Turkey and parts of Lebanon and Israel. In the wild, they live in a range of freshwater habitats: rivers, lakes, small ponds, and muddy streams. They’re bottom dwellers that hide among stones and vegetation, scraping algae and organic matter off submerged rocks using the hardened edges of their sucker mouth.
The fish thrive in subtropical water temperatures between roughly 15°C and 28°C (59–82°F). Their connection to human skin care reportedly began at the Kangal hot springs in Turkey, where bathers noticed the fish feeding on flaking skin. That observation eventually grew into a global spa trend.
How They Feed on Skin
Doctor fish don’t have conventional teeth. Instead, their lower lip forms a round suction pad with sharp, hardened edges designed for scraping. When placed in a warm water bath with a person, they latch onto the skin and gently remove dead or flaking cells. The sensation is often described as a light tickling or tingling.
The exact mechanism behind any therapeutic benefit isn’t fully understood. One leading explanation is that the fish clear away thick, scaly skin (particularly in conditions like psoriasis), which may allow UV light to penetrate more effectively during follow-up light therapy. Some marketing materials claim the fish secrete a natural enzyme called “diathanol” in their saliva that promotes new skin growth, but this remains largely unproven and is likely a marketing invention rather than established science.
It’s also worth noting that dead human skin isn’t their preferred food. In the wild, they eat algae and plankton. They only turn to human skin when they’re hungry enough, which is why fish used in commercial spas are typically starved beforehand to ensure they’ll feed on customers’ feet.
Use in Psoriasis Treatment
The most studied medical application of doctor fish is for psoriasis, a condition that causes thick, scaly patches on the skin. A pilot study of 67 patients with moderate to severe plaque psoriasis found that three weeks of fish therapy combined with UV light treatment reduced symptom severity scores by 71.7% on average. Nearly half the patients (46.3%) achieved a 75% improvement, and 91% achieved at least a 50% improvement. The average remission period lasted about 8.5 months, and 87.5% of patients rated the experience more favorably than other treatments they had tried.
These results are promising, but the therapy was delivered in a controlled outpatient medical setting with proper hygiene protocols and combined with UV treatment. That’s a very different environment from a shopping-mall fish spa. No significant side effects were reported in the clinical setting, which contrasts sharply with the infection risks documented in commercial spas.
Infection Risks at Fish Spas
The hygiene problem with fish pedicures is straightforward: you can’t sterilize a living animal between customers. The same fish that nibbled one person’s feet will nibble the next person’s, and the water they share becomes a potential vehicle for bacteria.
Testing of fish used in UK pedicure spas identified a concerning range of bacteria capable of causing soft tissue infections in humans. Among them were species that can cause wound infections and blood poisoning, particularly dangerous for people with diabetes, liver disease, or weakened immune systems. One investigation of 6,000 Garra rufa imported from Indonesia for UK spas found the fish themselves were riddled with bacterial infections. More than 95% died before the remainder had to be destroyed.
Spa-based fish therapy sessions typically last 15 to 30 minutes for cosmetic purposes, or about two hours for people seeking treatment for skin conditions like psoriasis or eczema. Multiple people have developed skin infections after spa sessions. Notably, no infections have been reported in supervised medical settings, likely because of stricter water quality and hygiene controls.
The Chin Chin Substitute
Not every fish used in a “fish pedicure” is actually a Garra rufa. As the trend spread from Turkey to Asia and beyond, a cheaper substitute species commonly called “Chin Chin” fish became popular. Unlike the toothless Garra rufa, Chin Chin fish can grow teeth and reach a significantly larger size. They can bite hard enough to break skin, creating open wounds that serve as a direct entry point for bacteria. If you’re considering a fish spa, knowing which species is in the tank matters, though in practice it can be difficult for a customer to tell the difference.
Where Fish Pedicures Are Banned
Fish pedicures have been banned in several U.S. states and Canadian provinces, primarily over sanitation concerns. Most state cosmetology boards require that tools used on clients be sanitized or disposed of between uses, a standard that living fish obviously can’t meet. The bans also reflect the inability to adequately filter and disinfect water that must remain hospitable to the fish.
In the UK, fish pedicures are not outright banned but are regulated, and a limited number of infections have been reported. The 2011 mass die-off of imported spa fish prompted formal investigation by the Fish Health Inspectorate, raising further questions about the conditions under which these fish are bred, transported, and maintained.
Animal Welfare Concerns
The commercial fish spa model depends on keeping Garra rufa hungry enough to eat human skin, which means deliberately withholding their natural food. The fish are imported in large numbers, often under stressful transport conditions, and shared across many customers in a single day. As the Cleveland Clinic has noted, the practice may be considered inhumane: the fish are purposely starved, confined to small tanks, and subjected to conditions far removed from their natural river habitats. The mass mortality event in the UK, where thousands of imported fish arrived already sick and dying, illustrates how poorly the supply chain can treat these animals.