Cracked Heels (Heel Fissures), Explained: Why They Happen & What Heals Them

By late summer — sandal season, barefoot on hot pavement, poolside — a lot of people notice their heels have gone hard, dry, and split at the edges. Cracked heels (medically, heel fissures) are more than a cosmetic annoyance: a deep crack is a genuine break in the skin that can hurt, bleed, and let in infection. Here's why they form and the routine that actually heals them.

Why heels crack

It starts with dry skin (xerosis). Here's the mechanics: when you stand, the fat pad under your heel is pressed down and bulges outward. Skin that's supple stretches with it — but skin that's dry, thickened, and inflexible can't, so the pressure splits it, forming fissures. A rim of hard callus around the heel makes this worse (AAD).

Common contributors:

• Open-backed shoes (flip-flops, slingbacks, clogs) that let the heel pad spread unsupported.
• Long hours standing, especially on hard floors.
• Hot showers, harsh soaps, low humidity — all strip the skin's moisture.
• Aging skin, which holds less water, and some medical conditions that dry skin out.

The routine that heals them

The best-evidenced approach is "soak and seal" plus gentle exfoliation — moisturizers are the mainstay of treatment for dry, fissured feet (systematic review).

• Keep showers short (5–10 minutes) and use a gentle, fragrance-free cleanser — long, hot washing dries heels further.
• Moisturize within a few minutes of bathing, while skin is still damp, to lock water in. Use a thicker cream or ointment, not a thin lotion.
• Choose active ingredients that soften thick skin. Creams with urea (often 10–25%), alpha hydroxy acids (lactic or glycolic), or salicylic acid both hydrate and gently exfoliate hardened heel skin so it turns flexible again.
• Seal overnight. Apply plain petroleum jelly at bedtime and wear socks.
• Protect an open crack. A liquid bandage over an actual fissure during the day forms a barrier that reduces pain and helps healing.
• Exfoliate gently. Lightly smoothing calluses with a foot file helps creams penetrate — but go easy; aggressive filing or "shaving" calluses can backfire.

Consistency is the whole thing: mild cracks often improve in a week or two, while thick calluses and deep fissures need daily effort to turn around.

The one group that shouldn't wait: diabetes and poor circulation

This is the most important safety point. A deep heel fissure is an open wound. For people with diabetes — who often have both drier feet (from nerve changes affecting the sweat glands) and reduced sensation and blood flow — a crack can go unnoticed, get infected, and progress to a serious foot ulcer (diabetes foot-care study). If you have diabetes, check your feet every day, moisturize proactively (but not between the toes, where trapped moisture invites athlete's foot), and get any crack looked at early rather than treating it yourself (AAD: diabetes and your skin).

When to see a doctor

See a board-certified dermatologist or a podiatrist if:

• Cracks are deep, painful, or bleeding.
• There are signs of infection — increasing redness, warmth, swelling, or pus.
• Good home care isn't helping after a couple of weeks.
• You have diabetes or poor circulation and notice any heel crack — get it evaluated promptly.

Healthy heels are part of whole-foot care: pair this with keeping your nails healthy and staying alert to athlete's foot, which loves the same dry-then-damp foot environment.

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Not sure whether your heel skin is just dry or something that needs treatment? A dermatrix.life skin assessment reviews photos you upload — feet included — and returns a private, plain-language summary of what it sees. It's informational only, not a diagnosis, and never a substitute for a professional — and if you have diabetes, a painful or infected-looking crack should be seen by a doctor. See how it works.