Reviewed by Evan Lewis, PhD. Last updated 11 August 2026.
Cracked heels occur when the skin barrier on the heel dries out, loses flexibility, and then splits under the pressure of standing. The skin at the heel edge is thick and has almost no oil glands, so once it stiffens it cannot stretch, and body weight opens a fissure instead.
That is the whole mechanism, and it explains why moisturising alone often fails. If you soften the surface but never deal with the pressure or the thickened rim, the same crack reopens in the same place.
Why does the skin dry out in the first place?
DermNet puts it at the barrier level: dry skin is due to abnormalities in the integrity of the barrier function of the stratum corneum, with an overall reduction in the lipids there. Less lipid means more water escaping, and skin with too little water in it behaves like leather rather than rubber.
It also notes that nearly everyone over 60 has dry skin, which is why heel fissures become steadily more common with age rather than appearing suddenly.
What makes cracked heels worse?
DermNet lists the environmental and habit factors, and the ones that matter for heels are these.
- Open-backed shoes. Sandals, mules and flip-flops let the heel pad spread sideways with every step, which is why cracks appear in summer and on holiday.
- Excessive bathing and hot water. DermNet's own prevention advice is to reduce bathing frequency and use lukewarm rather than hot water.
- Soap and detergents. Standard soap strips the lipids that were already low.
- Low humidity, including air conditioning in summer and direct heat from a fire or fan heater in winter.
- Standing all day, especially on hard floors, which is the pressure half of the equation.
- Frictional irritation from abrasives, which includes over-filing.
Do cracked heels mean something is wrong with your health?
Sometimes, and it is worth being precise about which claims have support and which do not, because this is a topic where the internet gets loud.
DermNet lists the conditions where dry skin appearing later in life can be a feature. The list is short and specific:
| Claim you will see online | Supported? |
|---|---|
| Hypothyroidism | Yes. DermNet names it directly, and the NIDDK describes how underactive thyroid slows body functions generally |
| Chronic kidney disease | Yes. DermNet lists chronic renal disease |
| Malnutrition or significant weight loss | Yes. On the list |
| Certain medications | Yes. Oral retinoids, diuretics and EGFR inhibitors are named |
| Menopause | Yes. Postmenopausal women are listed |
| Diabetes | Relevant, for a different reason. Not about dryness so much as risk if the skin breaks |
| Liver damage | No support on that list |
| Gallbladder problems | No support |
| "Detox" and toxin buildup | No. Not a mechanism |
So the honest position: most cracked heels are shoes, standing and dry air. But heels that crack badly for the first time in adulthood, alongside fatigue, cold intolerance, weight change or hair thinning, are worth a blood test rather than another tub of cream.
What actually helps?
DermNet is specific about what makes an emollient work, and two details matter more than the brand on the tube.
First, apply it to damp skin. DermNet notes emollients generally work best applied to damp skin, so straight after a shower rather than at a random point in the day. Second, look for humectants. It names urea and propylene glycol specifically, and urea is the ingredient that does something ordinary moisturiser does not: it holds water in the skin and softens thickened keratin at the same time.
The routine that works looks like this.
- Soak briefly in lukewarm water, not a long hot soak.
- Reduce the thickened rim gently with a foot file on dry or barely damp skin, a little at a time across several days.
- Apply a urea cream to damp skin right after, and again at night.
- Cover overnight with cotton socks to hold it against the skin.
- Change the shoes. A closed back holds the heel pad in and does more than any cream.
The American Academy of Dermatology's dry skin guidance covers the general version of this, including replacing ordinary soap with a gentler cleanser.
What should you never do to a cracked heel?
Some of the most-searched approaches are genuinely dangerous, and it is worth saying so plainly.
- Never use a knife, blade or callus shaver. Cutting into thickened heel skin is how a cosmetic problem becomes a wound. Reducing hard skin with a blade is a job for a foot care professional.
- Never use an electric grinder aggressively. Taking too much at once leaves the skin thin, sore and slower to recover than before you started.
- Never pour hot candle wax on your feet. This circulates as a home remedy. It is a burn risk, and on a foot with any loss of sensation it is a serious one.
- Do not pick or peel loose flaps. Tearing extends the fissure downward into skin that bleeds.
- Do not file an open crack. Work the thickened area around it, never the split itself.
Is it dry skin, or is it athlete's foot?
This catches a lot of people, and it is the reason some heels never respond to moisturiser. The StatPearls chapter on tinea pedis describes a chronic hyperkeratotic or moccasin-type pattern presenting as patchy or diffuse scaling on the bottom, medial and lateral sides of the feet. That looks exactly like stubborn dry skin.
Three things point at the fungal version: it is worse on one foot than the other, it extends up the sides of the foot in a slipper shape, and the skin between the outer toes is soft and white. Ordinary dry skin is symmetrical and spares the toe clefts. Foot fungus: what it is and what causes it covers the fungal side, and what athlete's foot looks like goes through the patterns properly.
The other lookalike is a seed corn, which is a small hard plug rather than a split. Seed corns on the foot covers how those differ from ordinary hard skin.
When do cracked heels need a doctor?
- You have diabetes, neuropathy or poor circulation. Then a heel fissure is a wound-risk problem and should be assessed, not self-managed.
- The crack is bleeding, or deep enough to see into.
- There is redness spreading around it, heat, swelling or discharge.
- It has not improved after several weeks of consistent urea cream and closed-back shoes.
- It appeared with other symptoms, such as fatigue, cold intolerance or unexplained weight change.
A split in the heel is an opening in the barrier that normally keeps everything out, which is where a daily foot routine earns its place alongside the cream. Sole Shield is the daily iodine spray we make for feet and shoes, used on clean dry skin and inside the footwear you put back on tomorrow. The cream deals with the dryness. The routine deals with what the crack lets in.
Common questions
Why do my cracked heels keep coming back?
Because the pressure and the shoes have not changed. Cream softens the surface, but an open-backed shoe lets the heel pad spread sideways with every step and the same fissure reopens. Closed-back shoes plus a urea cream on damp skin is the combination that holds.
Do cracked heels mean vitamin deficiency?
Usually not on their own. DermNet does list malnutrition and significant weight loss among the conditions associated with dry skin, so genuine nutritional deficiency can contribute, but for most people the cause is environmental rather than dietary.
Can cracked heels be a sign of liver problems?
There is no support for that on DermNet's list of conditions associated with dry skin. Hypothyroidism, chronic kidney disease, malnutrition, menopause and certain medications are on it. Liver damage and gallbladder problems are not.
Are cracked heels a sign of diabetes?
They are not a reliable sign of it, but they matter more if you have it. Reduced sensation means a deep fissure can go unnoticed, and slower healing gives bacteria more opportunity, so heel cracks in someone with diabetes should be looked at rather than managed at home.
What is the best thing to put on cracked heels?
A urea-based cream applied to damp skin. DermNet notes emollients work best on damp skin and names urea and propylene glycol as useful humectants. Petroleum jelly seals moisture in but does not soften thickened keratin the way urea does, so it works better over the top than instead of it.
Can you use a knife or blade on cracked heels?
No. Cutting thickened heel skin at home turns a dry-skin problem into an open wound. Reducing hard skin with a blade is a job for a podiatrist, chiropodist or foot care nurse, who can do it safely and assess what caused it.
Why are my heels cracked but not dry anywhere else?
Because the heel is the one place that combines thick skin, almost no oil glands, and your whole body weight landing on it. Skin elsewhere can be adequately hydrated while the heel rim is stiff enough to split.
Do cracked heels heal on their own?
Shallow ones often settle once the cause changes, for example moving out of open-backed shoes. Deeper fissures with a thickened rim tend to persist, because the hard edge stops the wound edges meeting.
Why do my heels crack in summer?
Open-backed shoes, sand and hot dry air together. Sandals let the heel spread outward under load, and DermNet lists low humidity and excessive air conditioning among the environmental causes of dry skin.
The bottom line
Cracked heels are a barrier problem plus a pressure problem, and fixing only one of them is why they keep returning. Urea cream on damp skin, gentle reduction of the thickened rim over several days, and closed-back shoes. Never a blade, a grinder or hot wax. And if they crack badly for the first time in adulthood alongside fatigue or weight change, or if you have diabetes, get it looked at rather than buying another cream.
