Clavus

Clavus

A clavus, commonly known as a corn, is a type of localized thickening of the skin that occurs due to repeated pressure or friction. Clavi are most often found on the feet, particularly on the tops and sides of the toes, and can cause significant discomfort or pain.

Pathophysiology

Clavi develop as a protective response of the skin to chronic mechanical stress. The repeated pressure or friction stimulates the proliferation of keratinocytes, leading to hyperkeratosis, which is the thickening of the stratum corneum, the outermost layer of the skin. This thickened area of skin forms a hard, dense core that can press into the underlying tissues, causing pain.

Types of Clavi

There are several types of clavi, each with distinct characteristics:

• Hard Clavus (Clavus Durus): This is the most common type, characterized by a hard, dense core. It typically forms on the tops of the toes or on the outer side of the little toe.

• Soft Clavus (Clavus Mollis): This type forms between the toes, where the skin is moist. It is softer and more pliable than a hard clavus.

• Seed Clavus (Clavus Miliaris): These are small, discrete clavi that can occur on the soles of the feet. They are often painless.

Diagnosis

Diagnosis of a clavus is primarily clinical, based on the appearance and location of the lesion. A healthcare provider may differentiate a clavus from other skin conditions such as callus, wart, or plantar wart by its characteristic central core and the presence of pain upon direct pressure.

Treatment

Treatment of clavi focuses on relieving pressure and reducing the thickened skin. Common approaches include:

• Mechanical Debridement: A healthcare provider may pare down the thickened skin using a scalpel.

• Keratolytic Agents: Topical treatments containing salicylic acid can help soften and gradually remove the thickened skin.

• Footwear Modification: Wearing properly fitting shoes and using protective pads can help reduce pressure on the affected area.

• Orthotic Devices: Custom orthotics may be recommended to redistribute pressure on the foot.

Prevention

Preventing clavi involves reducing the mechanical stress on the feet. This can be achieved by:

• Wearing well-fitting shoes with adequate room for the toes.
• Using protective pads or cushions in areas prone to pressure.
• Maintaining good foot hygiene to prevent moisture buildup between the toes.

Also see

• Callus
• Plantar wart
• Foot care
• Podiatry