Callosity

Baboon buttocks

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Moira Brown - MWB 0195-NEA-S4

Callosity refers to a thickened and hardened area of skin that has become relatively insensitive to touch due to repeated friction, pressure, or other irritation. Callosities are commonly known as calluses. They form as a protective response of the skin to prevent injury or blistering in areas of high stress. Callosities are most often found on the feet due to walking or on the hands from manual labor or playing musical instruments.

Formation

The formation of a callosity begins when the skin experiences repeated friction or pressure. The epidermis, which is the outermost layer of the skin, responds by accelerating the process of keratinization. During keratinization, the skin produces more keratin, a tough, protective protein. The increased production of keratin leads to the thickening of the epidermis, forming a callosity. This process is a natural defense mechanism to protect the underlying tissues from damage.

Common Locations

Callosities can occur on any part of the body that is subjected to repeated pressure or friction. However, they are most commonly found on:

• The feet, particularly on the soles, heels, and toes, due to walking or running.
• The hands, on the palms or fingers, from activities such as manual labor, playing musical instruments, or sports that require gripping equipment.
• The knees from professions or activities that involve kneeling.

Treatment and Management

While callosities are generally not harmful, they can sometimes lead to discomfort or even pain if they become too thick or if they crack. Treatment and management options include:

• Regularly moisturizing the affected area to keep the skin soft.
• Gently filing the callosity with a pumice stone or foot file after soaking in warm water to reduce thickness.
• Using protective padding or cushions to redistribute pressure away from the callosity.
• In severe cases, consulting a healthcare professional for removal or to check for underlying conditions like foot deformities that may contribute to callosity formation.

Prevention

Preventing the formation of callosities involves reducing friction and pressure on susceptible areas of the skin. This can be achieved by:

• Wearing well-fitting, comfortable shoes and socks that minimize rubbing against the feet.
• Using gloves or protective gear when engaging in activities that put pressure on the hands.
• Applying cushioning pads or insoles in shoes to distribute pressure more evenly on the feet.

See Also

• Corn
• Skin care
• Dermatology