Scaly leg in chickens: why especially in winter?
Scaly leg is a condition many chicken keepers will encounter sooner or later. Thickened scales, rough legs and sometimes even painful inflammations. Notably, scaly leg appears most often during the winter months. But why is that? And what can you do to prevent it?
Scaly leg mites
18 December '25 • 2 min reading time
What is scaly leg?
Scaly leg is caused by the scaly leg mite (Knemidocoptes mutans). This microscopic parasite settles underneath the scales of a chicken’s legs. There it burrows small tunnels, causing irritation, thickening of the skin and a build-up of chalky material. In severe cases, the legs can become deformed and walking may become painful for the chicken.
Why does scaly leg occur more often in winter?
That scaly leg is more common in winter is no coincidence. Several factors play a role:
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Reduced immunity During winter, a chicken’s immune system is often under strain. Less sunlight means reduced natural production of vitamin D, which is essential for immunity and skin health. Cold temperatures and fluctuations also require extra energy from the body.
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Less movement In winter, chickens tend to stay indoors more often or remain in the same spot. Reduced movement and prolonged time on perches allow mites to thrive with less disturbance.
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Damp and dirty housing To prevent drafts, chicken coops are often ventilated less in winter. This leads to higher humidity levels. Combined with wet bedding and droppings, this creates an ideal environment for parasites, including the scaly leg mite.
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Closer contact between chickens As chickens huddle closer together during cold periods, mites can spread more easily. One infected chicken can unknowingly pass the mites on to the rest of the flock.
How can you recognise scaly leg?
Look out for the following signs:
- Raised or thickened scales on the legs
- White or grey, chalk-like deposits
- A rough, uneven texture of the legs
- Lameness or reduced willingness to move The earlier the condition is detected, the easier it is to treat.
What can you do about scaly leg?
Fortunately, scaly leg can be treated effectively, but consistency is key:
- Isolate affected chickens if possible
- Thoroughly clean and disinfect the chicken coop
- Treat the legs with a suitable product against scaly leg mites
- Repeat the treatment as advised, as mite eggs must also be eliminated It is important to treat not only the legs but also the environment. Otherwise, the mites are likely to return.
Prevention is better than cure
Especially in winter, preventive measures are worthwhile:
- Ensure a dry, clean and well-ventilated coop
- Replace bedding regularly
- Check legs routinely during health inspections
- Support immunity with high-quality feed and, if needed, additional care products
In conclusion
Scaly leg can be unpleasant, but it is certainly no reason to panic. By understanding why it occurs more frequently in winter, you can take targeted action. With proper attention to hygiene, immunity and early warning signs, you can keep your chickens’ legs healthy even during the coldest months.