Every autumn the same thing happens.
Somebody comes in from a damp, cold walk with freezing feet. They sit down, put their feet directly in front of the radiator or the fire, and enjoy the sensation of warmth returning.
A few hours later their toes are itchy, swollen and an angry red or purple colour.
That is a chilblain, and the rewarming is a large part of why it happened.
Here is what they are, how to avoid them, and crucially when cold feet are telling you something more significant.
What Chilblains Actually Are
Chilblains, also called perniosis or pernio, are small, itchy or painful red to purple swellings that appear on the skin a few hours after cold exposure, most commonly on the toes.
The trigger is not extreme cold. It is cold combined with damp, at temperatures that are not freezing, which is precisely why they are so common in a British autumn and winter and why they appear in poorly heated homes.
The mechanism explains the rewarming problem. Small blood vessels beneath the skin constrict excessively in the cold. On rewarming, those small vessels expand more rapidly than the surrounding larger vessels can accommodate, and blood leaks into the surrounding tissue. The result is the swelling, redness and itching.
Which means rapid rewarming is the thing to avoid, and it is the thing almost everyone does instinctively.
They usually clear on their own within one to three weeks, and they do not normally cause lasting damage, though the affected skin may stay sensitive to cold afterwards.
Why Some People Get Them and Others Do Not
Not everybody exposed to cold and damp develops chilblains. Those who do appear to be more sensitive to changes in temperature.
Contributing factors include:
Repeated exposure to cold, damp or draughty conditions.
Tight shoes and damp socks, both of which further reduce circulation to the toes.
Poor peripheral circulation generally.
Living or working in cold, damp environments.
And areas of the foot exposed to pressure. Chilblains can occur over a bunion, or on a toe squeezed by tight footwear, because the pressure compounds the circulatory effect.
Which gives you a useful connection. Footwear that is too tight is both a direct cause of foot discomfort and a contributor to chilblains, and autumn is exactly when people put on boots and extra socks.
The Counterintuitive Sock Advice
Worth stating because it surprises people.
Piling on extra socks inside footwear that was not sized for them can make your feet colder, not warmer, because the compression restricts circulation.
A warm boot with room in it beats a tight boot with three pairs of socks, every time.
If you need more insulation, you need more room, which may mean different footwear rather than more layers.
Prevention
Keep your feet warm and dry, which in practice means changing out of damp socks and shoes promptly rather than waiting until you get home.
Avoid tight footwear and boots, which restrict circulation to the toes.
Rewarm gradually. Come in, put on dry socks, and let your feet come back to temperature at room temperature.
Never apply direct heat to cold feet. No radiators, no hot water bottles held against them, no feet in front of the fire. This matters generally and it matters enormously if you have any reduction in sensation, since you cannot detect a burn.
Moisturise regularly, since dry autumn skin cracks and cracks are an entry point for infection.
Keep moving. Gentle regular activity, including walking, improves circulation to the feet, and that is worth more than most of the products sold for this.
And heat your home adequately where you can, since chilblains are associated with cold, damp living conditions.
If You Have Them
Keep the area warm and dry and protect it from further cold. Most clear up on their own.
Do not scratch, however tempting, since broken skin can become infected.
Avoid rewarming quickly, which will make things worse.
And see your GP or a podiatrist if symptoms are ongoing, if you cannot get the discomfort under control, if you have a lot of them, if the skin breaks down, or if there are any signs of infection.
Your doctor may prescribe something for severe or recurrent cases.
What Chilblains Are Not
Two conditions get confused with them, and the distinction matters.
Raynaud’s Phenomenon
The pattern: fingers or toes turn white, then blue, then red in response to cold or stress, as the small blood vessels clamp shut and then reopen.
The colour sequence is the distinguishing feature. Chilblains do not usually produce that progression.
It is common and frequently harmless on its own, and it can also be associated with underlying conditions, which is why a new presentation is worth mentioning to your GP.
Chilblains and Raynaud’s can occur together, and the colour changes may appear before or after chilblain symptoms.
Frostbite
A different and more serious condition, caused by actual freezing of tissue, which chilblains are not. Chilblains do not cause tissue death.
When Cold Feet Mean Something Else
This is the section that matters most, because persistent cold feet are not always just cold feet.
Chilblains can be a sign of peripheral arterial disease, meaning reduced blood flow to the feet, and they are also associated, rarely, with conditions including lupus, connective tissue disorders and blood or bone marrow disorders.
Features that warrant a conversation with your GP:
Feet that are persistently cold, particularly if one is noticeably colder than the other.
Pain in the calf or thigh brought on reliably by walking and relieved by rest.
Pain in the foot at rest, particularly at night, relieved by hanging the leg out of bed.
Hair loss on the legs, shiny skin, or nails that have changed.
Wounds or sores that are slow to heal.
Numbness that is persistent rather than occurring only in the cold.
Chilblains that are severe, recurrent, occur outside cold weather, or do not clear within the expected few weeks.
And if you have diabetes, this is not a wait and see situation. Chilblains can become infected without being noticed where sensation is reduced, and any foot problem in diabetes warrants prompt assessment.
Seek Urgent Medical Attention For
A foot or toe that becomes suddenly cold, pale or blue with severe pain or numbness, which can indicate a sudden blockage of blood flow and is a medical emergency.
Any blackened or darkened tissue.
A wound with spreading redness, warmth, discharge or fever.
And contact your GP promptly for any non healing foot wound, particularly with diabetes or reduced sensation.
Let Us Look at the Whole Picture
Cold, uncomfortable feet in autumn are usually a matter of footwear, warmth and sensible rewarming. Occasionally they are the first sign of something that deserves investigating.
Ravenscroft Health offers a free discovery visit at no cost and no obligation. You will get a thorough assessment of your feet, footwear and circulation, practical guidance for getting through the colder months comfortably, and an honest view of whether anything you describe needs further investigation.
With GP input, diagnostic services and onward referral available where your presentation warrants it.
