Cracked heels: the overnight oil routine that actually helps

You notice it first on the bedsheet. A rough patch at the back of the heel catches the cotton. Then a white rim appears around the edge of the heel, and by February there is a line in it that stings when you stand up in the morning.

Cracked heels are one of the few skin problems where a cheap routine done properly at night genuinely changes things in a couple of weeks. It is also one where the internet gives some actively bad advice. Here is the routine, and here is the part to read before you start it.

Why heels crack

Your heel carries your body weight. Skin responds to that pressure by thickening into callus, which is a sensible defence and also the source of the problem. Callus is stiff. Normal skin stretches; callus does not. Every step spreads the fat pad of the heel outwards, and the rigid rim around it has to give somewhere. It splits.

Everything else on the list makes that worse:

• Dryness. Winter air, air conditioning, hard floors, hot water, long soaks, harsh soap.
• Open-backed footwear. Chappals and sandals let the heel pad spread sideways with nothing to hold it. This is the single most common cause in India.
• Standing all day, especially on tile or concrete.
• Extra body weight, which increases the pressure on the same rim.
• Skin conditions such as eczema or psoriasis on the feet.
• Some medical conditions, including diabetes and an underactive thyroid, which change how the skin behaves.

Read this before you start

Cracked heels are usually cosmetic. Sometimes they are not, and the difference matters more than anything else on this page.

See a doctor rather than treating this at home if you have diabetes, or any numbness, tingling or reduced feeling in your feet, or poor circulation. In that situation a heel fissure is a wound-care problem, not a beauty problem, and heel cracks can turn into foot ulcers. Do not use a pumice stone, a file, or anything sharp on a foot with reduced sensation. Get the feet looked at properly and follow what you are told.

Also see a doctor, whoever you are, if the crack bleeds, if it hurts to walk on, if the skin around it is red, warm, swollen or oozing, or if there is no improvement after a week or two of honest daily care. Cracked skin is an opening, and heel fissures can lead to infection of the surrounding tissue.

The overnight routine

1. Soak for ten to fifteen minutes in plain warm water. Not hot. Hot water strips the skin and leaves it drier than it started. You do not need salt, and you do not need an hour.
2. Pat mostly dry, and leave the skin slightly damp. Callus is far easier to work on when it is soft.
3. Pumice stone or foot file, gently, on damp skin only. Thirty to sixty seconds on the thickened rim, light strokes in one direction. The aim is to take a little off the top tonight, and a little more tomorrow night. You are not trying to remove the whole callus in one go, and trying will hurt you.
4. Dry the foot completely, including between the toes.
5. Be generous with the oil. About half a teaspoon per foot. Work it into the rim of the heel and into the crack itself first, then over the whole sole and the top of the foot.
6. Cotton socks, immediately. Old ones you do not mind spoiling. The socks hold the oil against the skin all night, keep it off your bedsheet, and are honestly half the reason this works.
7. In the morning, rinse, dry, and put a thin layer back on if you are wearing closed shoes.

Every night for two weeks. After that, three or four nights a week keeps it away. Skip the filing on most nights once the rim is down; the oil and the socks are the part you keep doing.

Why a thick oil suits this job

Castor oil is around ninety per cent ricinoleic acid, and it is noticeably thicker and tackier than any of our other oils. For a heel under a sock overnight, that is exactly the property you want. It stays where you put it instead of soaking straight into the cotton in twenty minutes, and it keeps a layer over the crack all night.

Cold pressed black sesame oil is the alternative for anyone who cannot stand the stickiness. It is lighter, absorbs faster, spreads more easily over the whole foot, and smells pleasantly nutty. It does the same job with less staying power.

A half-and-half blend is the sensible middle: castor for the heel rim, sesame to make the whole thing spreadable. Warm the oil slightly by standing the bottle in a mug of hot water for a minute. Warm oil goes on more thinly and more evenly.

What not to do

• No blades. Callus shavers and razors sold for feet are how people cut themselves badly and invite infection. Leave that to a podiatrist.
• Do not file hard, dry skin aggressively. You tear the healthy skin at the edges of the crack and make the split longer.
• Do not soak for an hour and do not use hot water. Both leave the skin drier once it dries out.
• Do not pull the loose flap of skin off. Trim it flush with clean nail scissors if it catches, or leave it.
• Do not walk on tile with freshly oiled feet. The fall is a bigger risk than the crack. Socks on before you stand up.
• Do not expect one night to undo six months. Callus took time to build and takes time to come down.

What oil will and will not do

Oil softens hardened skin and slows the water leaving it, so the callus becomes more flexible and is less likely to split further. Softer, more flexible skin around a crack is what lets the crack close over. That is the honest mechanism, and it is enough to make the routine worth doing.

It does not heal a fissure by itself, it does not remove callus, and it does not treat anything. It also does nothing whatever about the cause. If you stand on a hard floor in chappals for ten hours a day, your heels will keep doing this no matter what you put on them at night.

Fix the causes as well

• Wear something with a closed back, or at least a strap behind the heel, for the hours you are on your feet.
• A cushioned insole takes some of the pressure off the heel rim.
• Moisturise the feet daily, not only when they have cracked. Prevention here is much easier than repair.
• Dry between the toes every time. Damp skin between toes is a different problem entirely.
• Keep showers and soaks short, and use warm rather than hot water.

Once your heels are comfortable again, the nightly two minutes are worth keeping as a habit rather than a repair. Our guide to padabhyanga, oiling your feet before sleep, covers the same few minutes done as a wind-down ritual rather than a rescue. Do the repair routine first, though. Do not massage broken skin.