The fish that eat dead human skin are called Garra rufa, a small freshwater species native to river basins in Turkey, Syria, Iraq, and Iran. Commonly known as “doctor fish,” they use a specialized suction-cup mouth to latch onto skin and gently scrape away dead cells without breaking living tissue. A second species, known as Chin Chin fish, is sometimes used as a cheaper substitute but behaves quite differently.
How Garra Rufa Remove Dead Skin
Garra rufa are small, slender, greyish-brown fish that typically grow to about 5 to 12 centimeters long. Their secret is an unusual mouth structure: the lower lip expands into a round or oval sucking pad with sharp, hardened edges made of keratin, the same protein found in human fingernails. This pad lets the fish attach firmly to surfaces and scrape material off. In the wild, they use it to graze algae and organic film off submerged rocks and logs. On human skin, the same mechanism removes dead skin cells (keratinocytes) while leaving healthy tissue intact.
These fish have no true biting teeth in their jaws. They do have pharyngeal teeth, small structures deep in the throat used for processing food, but nothing that contacts your skin directly. The experience feels like a light tickling or buzzing sensation rather than biting.
Why They Eat Skin in the First Place
Garra rufa are omnivores. Their primary diet in the wild consists of phytoplankton, algae, and organic debris, supplemented by bacteria, zooplankton, and small invertebrates. Dead human skin is not their preferred meal. It’s an opportunistic food source they turn to when their usual diet is limited.
The connection between these fish and human skin was first observed in hot springs near Kangal, Turkey, where water temperatures reach around 35 to 36°C. Garra rufa are unusually tolerant of warm water, which lets them thrive in thermal pools where other fish cannot survive and where food options are scarce. Bathers soaking in these springs provided an easy source of organic material, and over time the fish became famous for nibbling away flaking skin. This natural behavior is what launched the global fish spa industry.
The Chin Chin Problem
Not every fish spa uses genuine Garra rufa. A cheaper alternative called Chin Chin (Cyprinion macrostomus), a Chinese freshwater species, looks similar but differs in one critical way: Chin Chin fish grow actual teeth. They can bite hard enough to break the skin and draw blood, which creates an entry point for bacteria. If you’ve had a fish pedicure that felt painful rather than ticklish, Chin Chin fish may have been in the tank. There is no reliable way for a customer to tell the two species apart by sight.
Fish Therapy for Psoriasis
The most studied medical application of Garra rufa is treating psoriasis, a condition where skin cells build up into thick, scaly patches. A pilot study of 67 psoriasis patients who underwent three weeks of fish therapy at a clinic in Austria found a 71.7% average reduction in symptom severity scores. Nearly half the patients (46.3%) achieved a 75% or greater improvement, and 91% achieved at least 50% improvement. The average remission period after treatment lasted about 8.5 months, and 87.5% of patients rated fish therapy more favorably than other treatments they had tried. Sixty-five percent said that when their symptoms eventually returned, they were less severe than before.
These results are promising but come from a small, retrospective study without a control group. The warm water and extended soaking likely contribute to the effect alongside the fish themselves. Still, the combination of gentle physical exfoliation and thermal bathing appears to offer genuine, if temporary, relief for some people with chronic skin conditions.
Infection Risks From Fish Spas
The main health concern with fish pedicures is bacterial exposure. A CDC-published study analyzing fish used in pedicure spas identified a wide range of human pathogens in the tank water, including Streptococcus agalactiae (group B Strep), Aeromonas species, Vibrio vulnificus, non-cholera Vibrio strains, and Mycobacteria. Streptococcus agalactiae is a common cause of skin and soft tissue infections, particularly in older adults and people with diabetes or other chronic conditions.
The fundamental sanitation problem is that the fish themselves cannot be sterilized between customers. Standard spa protocols call for disinfecting tools between uses, but a living fish obviously can’t be autoclaved or soaked in disinfectant. The water can be filtered and treated with UV light, but any pathogens living on or inside the fish persist. Multiple customers share the same group of fish throughout the day, creating a chain of potential cross-contamination. Even small, invisible cuts or hangnails on your feet provide enough of an opening for bacteria to enter.
Where Fish Pedicures Are Banned
Because of these sanitation concerns, fish pedicures have been banned in several U.S. states and Canadian provinces. The bans center on two issues: the inability to adequately disinfect living fish between clients, and the fact that reusing animals across customers violates standard cosmetology sanitation codes. States with bans include Texas, Florida, Washington, New Hampshire, and others. In the U.K., fish spas remain legal but are regulated, and a small number of infections following fish pedicures have been documented.
Where fish spas do operate legally, regulations vary widely. Some jurisdictions require UV water treatment systems, minimum water change frequencies, and limits on the number of customers per tank per day. Others have almost no oversight. If you choose to try a fish pedicure, the cleanliness of the facility and how many people have used the same tank that day are the most practical indicators of risk. People with open wounds, compromised immune systems, or diabetes face the highest chance of complications.
Other Animals That Eat Dead Skin
Garra rufa are the most commercially used skin-eating fish, but they’re not the only aquatic species with this behavior. Several other Garra species found across Asia and the Middle East share similar mouth anatomy and feeding habits. Certain species of cleaner wrasse and cleaner shrimp in ocean reef systems perform a parallel role, removing dead skin and parasites from larger fish at dedicated “cleaning stations” on coral reefs. The relationship between cleaner fish and their clients is one of the best-known examples of mutualism in marine biology, though these species aren’t used in human spas.