You get jiggers when a female sand flea burrows into your skin, typically on your feet. The flea, known scientifically as Tunga penetrans, lives in sandy soil in tropical regions and jumps onto exposed skin when you walk barefoot or sit on infested ground. Once embedded, it feeds on your blood, swells to hundreds of times its original size, and produces eggs over the course of several weeks. The resulting condition is called tungiasis, and over 1 billion people live in areas where transmission is possible.
Where Jiggers Come From
Jigger fleas thrive in sandy, warm environments. Beaches, farms, stables, and the dusty ground around homes in tropical areas are their primary habitats. The fleas go through their early life stages in the soil: eggs hatch into larvae that feed on organic debris, then develop into pupae inside cocoons coated with sand and pebbles. Adult fleas emerge from the soil ready to find a host.
Both male and female jigger fleas bite, but only the female burrows into skin. Males feed briefly and leave, like a mosquito. The female, however, digs headfirst into the outer layer of skin, leaves only a tiny opening at the surface, and begins feeding continuously. She swells dramatically as her abdomen fills with developing eggs, growing from about 1 millimeter to roughly the size of a pea. Over one to two weeks, she expels hundreds of eggs through that small opening in the skin, then dies in place. Her body is eventually shed as the skin renews itself.
How You Come Into Contact
The single biggest risk factor is bare skin touching infested ground. Jigger fleas can’t fly or travel far. They jump from the soil onto a host that’s directly overhead. That’s why the vast majority of infestations occur on the feet, especially around the toenails, between the toes, and on the soles. Less commonly, the fleas burrow into hands, elbows, or other body parts that contact the ground.
You don’t catch jiggers from another person. The flea comes from the environment. But animals play a role in keeping the cycle going. Dogs, cats, pigs, and rats all serve as hosts, meaning a household with infested animals will have fleas continuously breeding and releasing eggs back into the surrounding soil. A yard or compound littered with organic waste provides ideal conditions for larvae to feed and develop.
Housing conditions matter enormously. Case studies from Brazil documented severe infestations in families living in huts with sandy floors and no concrete foundation. When the flea’s habitat is literally the floor of your home, reinfection becomes almost constant. Researchers have noted that severe tungiasis occurs when environmental, socioeconomic, and behavioral factors overlap, particularly when people can’t afford concrete flooring or can’t remove embedded fleas early enough to prevent complications.
Where Jiggers Are Found
Tungiasis is endemic in tropical and subtropical parts of the Caribbean, South America, and sub-Saharan Africa. Within these regions, the distribution is patchy. Some communities report that fewer than 10% of residents are affected, while others see prevalence as high as 63%. No country routinely tracks the disease, so the full burden remains unknown.
Travelers to endemic areas can also pick up jigger fleas, though this is far less common than infestations among local populations. Walking barefoot on a beach, visiting a rural farm, or staying in accommodations with sand or dirt floors all create opportunities for exposure.
What an Infestation Looks and Feels Like
The first sign is usually a small dark spot on the skin, often near a toenail, surrounded by a white halo. You might feel itching or a mild stinging sensation as the flea burrows in. Over the next several days, the spot grows into a raised, round lesion as the flea swells beneath the surface. A tiny black dot at the center marks the opening where the flea breathes and expels eggs.
A single embedded flea is uncomfortable but manageable. The real danger comes with heavy or repeated infestations, where dozens or even hundreds of fleas may be embedded at once. This can cause intense pain, difficulty walking, and nail deformity or loss. The open wounds left behind are vulnerable to bacterial infections, which can lead to swelling, pus, and in severe cases, tissue death. In areas without access to tetanus vaccination, the wounds also carry a risk of tetanus.
Why Shoes Alone Don’t Solve It
The instinctive advice is to wear closed-toe shoes, and that’s not wrong, but the protection shoes offer is surprisingly limited. A field study in rural Madagascar tested whether providing shoes reduced jigger infestations and found only a marginal decrease. At the end of the 10-week study, people in the shoe group still had a median of 15 embedded fleas, and the difference between the shoe group and the control group (no intervention) was not statistically significant at any point during the trial.
The likely explanation is practical: people in endemic areas don’t wear shoes every minute of every day. They remove them indoors, while bathing, or while sleeping on the floor. Even brief contact with infested soil is enough for a flea to latch on.
A coconut oil-based repellent called Zanzarin performed far better in the same study. Applied twice daily to the feet, it reduced the rate of new infestations to zero within two weeks and kept it there for the duration of the trial. The repellent created a chemical barrier that deterred fleas even when skin was exposed. This suggests that topical protection is more effective than physical barriers alone, since it works continuously regardless of whether shoes are on or off.
Removing Jigger Fleas Safely
The standard treatment is physical removal. A sterile needle or fine blade is used to widen the opening in the skin and extract the entire flea without rupturing it. Rupturing the flea can trigger an inflammatory reaction and increase infection risk. After extraction, the wound is disinfected and covered.
In endemic communities, people often remove fleas themselves using thorns, safety pins, or other non-sterile tools, which raises the risk of secondary infections. When extraction is done with clean instruments and proper wound care, most lesions heal within a week or two without complications. For heavy infestations, a topical suffocating agent can be applied to kill the embedded fleas, making removal easier and reducing the chance of leaving flea parts behind in the skin.
Reducing Your Risk
If you’re traveling to an endemic area, wearing closed-toe shoes is a reasonable starting point, but it shouldn’t be your only precaution. Applying a repellent to your feet twice daily provides stronger protection. Avoid sitting or lying directly on sandy ground, particularly around farms, stables, or areas with free-roaming animals. Inspect your feet daily, especially between and under the toes, and seek removal of any embedded flea as soon as possible. Early removal, before the flea has swelled significantly, is simpler, less painful, and far less likely to lead to complications.
For communities where tungiasis is common, the most impactful long-term measures involve replacing sand and dirt floors with concrete, reducing animal reservoirs through veterinary treatment, and ensuring access to repellents and sterile extraction tools. These structural changes address the root of the problem: an environment where jigger fleas can breed continuously, just inches from the people they infest.