Why do mosquitoes bite feet specifically?

Feet are the most bacteria-rich, odour-heavy part of the human body, and mosquitoes home in on those bacterial scents. In a landmark 1996 study published in The Lancet, entomologist Bart Knols found that Anopheles gambiae mosquitoes were drawn to Limburger cheese and to human foot odour at nearly identical rates — both smells are produced by Brevibacterium bacteria. Feet also have a very high density of sweat glands, and being enclosed in socks and shoes all day keeps them warm, moist, and bacteria-rich. That combination of scent, warmth, and moisture makes feet a top target.

What is the Limburger cheese and mosquito connection?

Limburger cheese gets its pungent smell from Brevibacterium linens — a bacterium closely related to the Brevibacterium species that live on human feet and produce foot odour. In a 1996 experiment, researcher Bart Knols showed that malaria-carrying Anopheles gambiae mosquitoes were as attracted to Limburger cheese as they were to a smelly human foot. The takeaway is not that cheese attracts mosquitoes in your yard, but that the specific bacterial compounds behind foot odour are a genuine, research-backed mosquito attractant.

Why do mosquitoes bite my ankles so much more than the rest of me?

Three ground-level factors stack together on your ankles. First, exhaled CO2 sinks and collects low near the ground because it is denser than air. Second, foot and ankle odour from skin bacteria is among the strongest chemical signals on your body. Third, ankles are usually exposed below shorts, are hard to see, and are difficult to swat — so a mosquito can feed there uninterrupted. Low-flying, daytime-biting Aedes species reinforce the pattern by hunting close to the ground. When all of these line up, your ankles take a disproportionate share of the bites.

How do I stop mosquitoes from biting my ankles?

Cover and treat the lower legs, and reduce the mosquito population in your yard. Wear socks and closed shoes instead of sandals, and choose light-coloured, loose clothing. Apply a Health Canada-registered repellent with DEET or picaridin from the knee down, paying attention to the ankles, socks, and shoe line. Wash your feet before heading outdoors at dusk to strip away the bacteria mosquitoes track. Around the yard, tip out standing water weekly and treat shaded resting areas. A running fan on the patio also helps, because mosquitoes are weak fliers and ankles are exactly where a floor-level fan disrupts them.

Do mosquitoes prefer to bite lower on the body?

Yes, for many common species. Day-active, low-flying mosquitoes such as Aedes aegypti and Aedes albopictus tend to approach from near the ground and bite the lower legs, ankles, and feet more often than the upper body. This is partly behaviour and partly physics: CO2 and warm, humid air near the skin sink toward the ground, giving these mosquitoes a strong low-level scent trail to follow. Evening-active species will also bite exposed upper skin, but the lower legs remain a consistent hotspot.

Does washing my feet reduce mosquito bites?

It can help. Foot odour that attracts mosquitoes comes largely from bacteria breaking down sweat, so rinsing or washing your feet before going outside temporarily reduces the bacterial scent mosquitoes track. Wearing clean socks and breathable shoes, and letting feet dry out, also limits the warm, moist, bacteria-friendly environment. Washing is not a complete solution on its own — the bacteria return — but combined with a repellent and covered footwear it meaningfully lowers ankle and foot bites.

Why do I get bitten on the ankles even indoors or through socks?

Aedes mosquitoes, which are common summer biters in Ontario, are aggressive daytime feeders that readily come indoors and can bite through thin fabric like a single layer of sock or leggings. Because they hunt low, your ankles and feet are the easiest target even when you are inside. Thicker or looser clothing, closed shoes, and a repellent applied to the ankle area reduce bites that come through thin socks. Check window screens and doors, since a few mosquitoes indoors will concentrate their attention on any exposed lower skin.

Are ankle bites more likely to get infected?

Ankle and foot bites are not inherently more dangerous, but they can be more prone to irritation because the area is often rubbed by socks and shoes and is easy to scratch. Scratching breaks the skin and can allow a secondary bacterial infection. Most mosquito bites are simply itchy and heal on their own; keeping the bite clean and avoiding scratching helps. If you develop spreading redness, increasing pain, fever, or symptoms of illness after bites, contact a healthcare provider — this is general information, not medical advice.

Why do mosquitoes bite some people on the ankles more than others?

Individual differences in skin bacteria, sweat chemistry, body heat, and CO2 output make some people more attractive to mosquitoes overall, and those differences show up strongly at the feet and ankles. Twin studies suggest attractiveness to mosquitoes is largely heritable — roughly 85% by some estimates. If your feet host a particular mix of odour-producing bacteria, or you run warm and exhale more CO2, your ankles will draw more bites than the person beside you. You cannot change your genetics, but covered footwear, a repellent, and yard treatment level the playing field.

Why Do Mosquitoes Bite My Ankles and Feet? (The Science)

Q: Why do mosquitoes bite my ankles and feet?

Mosquitoes bite your ankles and feet because that is where their strongest tracking cues concentrate at ground level. Carbon dioxide is about 1.5 times denser than air, so the CO2 you exhale sinks and pools low near the ground where your ankles are. On top of that, feet carry one of the densest communities of odour-producing bacteria on the body — especially Brevibacterium, the same genus that ripens Limburger cheese — and mosquitoes find those bacterial scents powerfully attractive. Low-flying species like Aedes aegypti and Aedes albopictus naturally hunt near the ground and preferentially attack the lower legs, ankles, and feet. Finally, ankles are often left bare below shorts and are hard to watch, so bites land before you notice the mosquito.

Body zone	Bite likelihood	Why
Ankles & feet	Very high	Ground-level CO₂ pooling + dense foot-bacteria odour + usually exposed
Lower legs (calves)	High	Low-flying species approach from the ground; often bare below shorts
Hands & wrists	Moderate	Exposed skin, warmth, and movement draw the final strike
Neck & face	Moderate	Close to exhaled CO₂ and radiating body heat
Torso & back	Low	Usually covered by clothing; farther from ground-level cues

By Alex and The Mosquito Team

BuzzSkito Mosquito & Tick Control Specialists · Published July 16, 2026

Why do mosquitoes bite my ankles?

Mosquitoes bite your ankles because they sit at ground level, exactly where a mosquito’s strongest tracking cues collect. The carbon dioxide you exhale is about 1.5 times denser than air, so instead of rising it sinks and pools low, forming an invisible scent trail near the ground. Add the concentrated odour of foot-and-ankle bacteria, and your lower legs become the loudest “human host” signal on your whole body.

Behaviour reinforces the physics. Many of the mosquitoes you meet in a GTA backyard — particularly the daytime Aedes species — are low fliers that naturally hunt close to the ground. They intercept that pooled CO₂ and follow it straight to your ankles. Because your ankles are usually bare below shorts, hard to see, and awkward to swat, the mosquito gets an uninterrupted meal before you even register it is there. It is the same host-detection system described in our guide to what attracts mosquitoes to you — just concentrated at the lowest, most exposed part of your body.

Why do mosquitoes bite feet?

Feet get bitten because they are the most bacteria-rich, odour-heavy part of the human body, and mosquitoes home in on those bacterial scents. Your feet have a very high density of sweat glands, and skin bacteria break that sweat down into the compounds that give feet their characteristic smell — the exact chemistry mosquitoes are tuned to detect.

The most famous evidence is almost comic. In a 1996 study published in The Lancet, Dutch entomologist Bart Knols found that Anopheles gambiae mosquitoes were drawn to Limburger cheese at nearly the same rate as to a smelly human foot. The reason: Limburger is ripened with Brevibacterium linens, a bacterium closely related to the Brevibacterium species that live between human toes and produce foot odour. The cheese and the foot literally share a scent family — and to a mosquito, both smell like dinner.

Footwear makes it worse. Socks and closed shoes trap heat and moisture all day, creating a warm, humid, low-oxygen environment where odour-producing bacteria thrive. By the time you slip off your shoes on a summer evening, your feet are broadcasting a bacterial signal that a host-seeking female mosquito can lock onto immediately.

Why do mosquitoes bite ankles so much?

Ankles take a disproportionate share of bites because three separate factors stack on the same small patch of skin. First, ground-level CO₂ pooling puts the mosquito’s primary long-range cue right at ankle height. Second, foot-and-ankle bacterial odour is one of the strongest chemical signals your body produces. Third, exposure and low visibility mean your ankles are both easy to reach and easy to feed on unnoticed.

No other part of your body lines up all three at once. Your face is close to your exhaled CO₂ and body heat, but it is in your field of view and quick to defend. Your torso is usually covered. Your ankles, by contrast, are bare, at ground level, bacteria-rich, and out of sight below your eyeline — a perfect storm. This is also why the same person often gets hammered on the ankles year after year: personal skin chemistry and bacteria are largely fixed, which we cover in why mosquitoes bite some people more than others.

How to stop ankle bites

The fastest way to stop ankle bites is to cover and treat the lower legs and cut the mosquito population in your yard. Because ankles are a physics-and-chemistry problem, the fixes are simple and layered:

Cover your feet and ankles. Swap sandals for socks and closed shoes at dusk. Even thin coverage removes the easiest target — though Aedes can bite through a single thin sock layer, so pair it with repellent.
Apply repellent from the knee down. Use a Health Canada-registered repellent with DEET or picaridin, focusing on ankles, the sock line, and the tops of your feet — the spots people routinely miss.
Wash your feet before going out. Rinsing away sweat and bacteria temporarily lowers the foot odour mosquitoes track. Clean, dry socks help keep it down.
Wear light, loose colours. Mosquitoes track dark, high-contrast colours by sight in the final approach, so pale, loose clothing makes your lower legs harder to spot.
Run a floor-level fan on the patio. Mosquitoes are weak fliers, and a fan aimed low disrupts them right where they attack — at ankle height.
Kill the breeding and resting sites. Tip out standing water weekly and treat the shaded, low vegetation where mosquitoes rest during the day. Fewer mosquitoes near the ground means fewer ankle bites.

Personal repellent hides you for a few hours; it does not lower how many mosquitoes are cruising your yard at ankle height. For lasting relief, the two approaches work best together — cover up on your body, and thin out the population at the source.

A quick word on bites and health

In Ontario, the vast majority of mosquito bites — including the itchy ankle clusters — are harmless nuisances that heal on their own. The main mosquito-borne concern locally is West Nile virus, which Public Health Ontario and the Public Health Agency of Canada (PHAC) monitor each season, though the risk of illness from any single bite is low. Ankle and foot bites can get irritated because socks and shoes rub them, and scratching can break the skin and invite a secondary infection. Keep bites clean, resist scratching, and if you notice spreading redness, worsening pain, fever, or feel unwell after being bitten, contact a healthcare provider. This article is general information, not medical advice.

The bottom line

Your ankles and feet are not unlucky — they are the ideal target. Ground-level CO₂ pooling, dense foot-bacteria odour that literally shares a scent family with Limburger cheese, low-flying Aedes species, and bare, hard-to-watch skin all converge on the same few centimetres. You cannot change the physics of CO₂ or your foot microbiome, but you can cover up below the knee, use a registered repellent, wash before dusk, and thin out the mosquito population in your yard. Do those four things and the ankle-bite hotspot cools right down.