Corn and Callus Removal Products

Corn versus callus: what is the difference?

A callus is a broad, flat area of thickened skin, typically on the ball of the foot or the heel. It develops in response to distributed pressure and is usually painless or mildly uncomfortable. Calluses on the hands (from gardening or weight training) are the same process.

A corn is a focused, cone-shaped plug of hard skin with a dense centre (the nucleus) that presses into the underlying tissue. That nucleus is why corns hurt. Hard corns form on the tops and sides of toes; soft corns (heloma molle) develop between toes where moisture keeps the skin macerated. Seed corns are tiny superficial clusters, usually on the sole, that are more annoying than painful.

Salicylic acid: the main OTC treatment

Salicylic acid is a keratolytic: it breaks down keratin, the protein that forms the thickened skin. Products range from 12% to 40% concentration. Lower strengths (12-17%) come as liquids or gels painted onto the corn daily. Higher strengths (40%) are sold as adhesive pads or plasters. Bazuka, Carnation and Scholl are the brands you will find in most UK pharmacies.

Application is straightforward. Soak the foot in warm water for five to ten minutes, dry thoroughly, then apply the product to the corn or callus only. Protect surrounding healthy skin with petroleum jelly. A pumice stone or foot file between applications removes the softened dead skin layer. Most products need four to eight weeks of consistent use.

Cure rates are reasonable for superficial corns and calluses. A 2012 Cochrane review found salicylic acid more effective than placebo, with a relative risk of resolution around 1.6. Deep corns with a hard nucleus may not clear completely with OTC products alone.

Other pharmacy products

Urea-based creams (25-40%) soften callused skin without the acidic action of salicylic acid. They are gentler and can be used over larger areas. Flexitol Heel Balm (25% urea) is a popular choice for cracked heels and generalised callus. Apply once or twice daily and file gently after a few days.

Silver nitrate sticks are sometimes used by podiatrists to cauterise the core of stubborn corns. This is a clinical procedure, not a home remedy. Avoid corn plasters that contain ferric chloride or strong acids. They are unpredictable and can cause chemical burns, particularly on thinner skin between the toes.

Professional podiatry treatment

A podiatrist removes corns and calluses with a scalpel. Painless, precise and immediately effective. The thickened skin is pared down to normal thickness, and the corn nucleus is enucleated (scooped out). Relief is usually instant. No anaesthetic is needed.

The limitation is recurrence. Unless the underlying cause (pressure from ill-fitting shoes, a bony prominence, an abnormal gait pattern) is addressed, the corn or callus will regrow in weeks to months. This is why we often combine debridement with orthotic prescription or footwear advice. Silicone toe props and interdigital wedges can offload specific pressure points between appointments.

Diabetes and corns: a different situation entirely

If you have diabetes, peripheral neuropathy or poor circulation, do not use salicylic acid products on your feet. The acid can damage skin you cannot feel, and the resulting wound may not heal properly. Corn plasters are particularly risky: the adhesive pulls fragile skin, and the acid works away unnoticed.

Diabetic patients should have corns and calluses treated by a podiatrist only. This is not overcaution. NHS data shows that diabetic foot ulcers frequently start as a corn or callus that was either left untreated or treated inappropriately at home. Your annual diabetic foot assessment (see our diabetic foot care page) includes checking for pressure areas that may develop into corns.

Preventing corns and calluses

Shoes that fit properly are the single most important factor. The toe box should allow toes to move freely without rubbing. Women's pointed shoes and men's narrow dress shoes are the worst offenders. Buy shoes in the afternoon when feet are slightly swollen. If a shoe needs 'breaking in,' it does not fit.

For professional assessment and treatment, book an appointment through our podiatry clinic (/services/podiatry/).

Further reading

Diabetic patients should read our diabetic foot care guide (/health-info/diabetic-foot-care/) before treating corns at home.

For professional corn removal and orthotic advice, book through our podiatry clinic (/services/podiatry/).

Disclaimer

This information is for educational purposes only and does not replace individual medical advice. Always consult your podiatrist or GP before treating corns or calluses at home, especially if you have diabetes, peripheral vascular disease or any condition affecting skin healing.