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Corn or Wart – Differences and Treatment
Corn or wart? Both cause skin changes on the foot but differ in cause and treatment. Learn how to tell them apart and when to see a doctor.
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Corn or wart? Both cause skin changes on the foot but differ in cause and treatment. Learn how to tell them apart and when to see a doctor.
What is a Corn?
A corn (medically known as a clavus) is a localized, cone-shaped thickening of the skin caused by repeated pressure or friction on specific areas of the skin. Corns most commonly develop on the toes or the sole of the foot. The hard, inward-pointing core of the corn presses on underlying tissue and can cause significant pain.
What is a Wart?
A wart (medically: verruca) is a benign skin growth caused by an infection with the Human Papillomavirus (HPV). Warts on the foot are called plantar warts or verruca plantaris and often grow inward due to body weight. They are contagious and can spread to other parts of the body or to other people.
Differences Between a Corn and a Wart
Since both conditions can look similar, accurate differentiation is essential for correct treatment:
- Cause: Corns are caused by mechanical pressure (e.g., tight footwear); warts are caused by an HPV viral infection.
- Appearance: A corn has a hard, translucent central core. A wart shows small black dots (thrombosed capillaries) and has an irregular, cauliflower-like surface.
- Pain: Corns are painful when direct pressure is applied to the core. Warts are usually less painful, but can cause discomfort when located in pressure areas.
- Skin lines: The natural skin lines (fingerprint lines) are interrupted by a wart, while they pass through a corn uninterrupted.
- Contagion: Corns are not contagious; warts are.
Causes
Causes of a Corn
- Tight or ill-fitting footwear
- Toe deformities (e.g., hammer toe)
- Abnormal gait or incorrect weight distribution on the foot
- Prolonged standing or walking on hard surfaces
Causes of a Wart
- Infection with specific HPV types (especially types 1, 2, and 4)
- Walking barefoot in moist public areas (swimming pools, showers, saunas)
- Small cuts or cracks in the skin that allow the virus to enter
- A weakened immune system increases the risk of infection
Diagnosis
A doctor can usually distinguish between a corn and a wart through clinical examination. The outermost layer of hardened skin is often gently removed to assess the interior of the lesion. A corn reveals a hard, translucent core, while a wart shows pinpoint bleeding spots (black dots). In unclear cases, dermoscopy (epiluminescence microscopy) can provide additional diagnostic information.
Treatment
Treatment of a Corn
- Pressure relief: Wearing well-fitting footwear, using orthopedic insoles or protective padding.
- Debridement: Removal of thickened skin by a doctor or a qualified podiatrist.
- Keratolytic agents: Salicylic acid plasters or solutions to soften and break down hardened skin.
- Addressing the underlying cause: Correction of foot deformities through orthopedic measures.
Treatment of a Wart
- Salicylic acid preparations: Over-the-counter topical treatments for local application.
- Cryotherapy: Freezing the wart with liquid nitrogen, performed by a healthcare professional.
- Laser or electrosurgery: For persistent or recurrent warts.
- Immunotherapy: Stimulating the immune system to fight the virus.
- Watchful waiting: Many warts in children resolve spontaneously as the immune system clears the virus.
When to See a Doctor
You should seek medical advice if:
- the lesion is very painful or grows rapidly,
- you have diabetes mellitus or circulatory disorders (increased risk of complications),
- self-treatment shows no improvement after several weeks,
- you are unsure whether you have a corn or a wart.
References
- Deutsche Dermatologische Gesellschaft (DDG): Guideline on the Treatment of Warts. AWMF Register No. 013-091 (2020).
- Wolff K., Johnson R.A., Saavedra A.P.: Fitzpatrick's Color Atlas and Synopsis of Clinical Dermatology. 8th edition. McGraw-Hill, 2017.
- World Health Organization (WHO): Human Papillomavirus (HPV) Fact Sheet. www.who.int (accessed 2024).
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