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What is the difference between hypertrophic and keloid scars?

Hypertrophic and keloid scars are both types of abnormal scars that can form as a result of the body’s natural healing process. While they share some similarities, there are distinct differences between the two.

Hypertrophic Scars:

Hypertrophic scars are raised, thickened scars that develop at the site of a wound or injury. They occur when the body produces an excess amount of collagen during the healing process. These scars usually stay within the boundaries of the original wound and may gradually fade over time. Hypertrophic scars are typically red or pink in color and can be itchy or painful.

Some common causes of hypertrophic scars include surgical incisions, burns, acne, and piercings. They tend to occur more frequently in individuals with darker skin tones and those who have a genetic predisposition to scar formation.

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Keloid Scars:

Keloid scars, on the other hand, are characterized by their raised, thickened appearance that extends beyond the boundaries of the original wound. Unlike hypertrophic scars, keloids do not regress over time and can continue to grow indefinitely. They often have a shiny, smooth surface and can be pink, red, or darker than the surrounding skin.

Keloids are caused by an overproduction of collagen, similar to hypertrophic scars. However, in keloid formation, the collagen production does not stop after the wound has healed, leading to the excessive growth of scar tissue. Keloids can be triggered by various factors, including trauma, surgery, acne, ear piercings, and even minor skin injuries.

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Distinguishing Features:

The main difference between hypertrophic and keloid scars lies in their growth patterns and extent. Hypertrophic scars are confined to the original wound area and may regress over time, while keloids extend beyond the wound boundaries and continue to grow.

Additionally, keloids are more likely to cause symptoms such as itching, pain, and tenderness compared to hypertrophic scars. They can also be more challenging to treat due to their persistent nature.

It is important to note that the distinction between hypertrophic and keloid scars is not always clear-cut, and some scars may exhibit characteristics of both types. Consulting with a healthcare professional or dermatologist can help determine the most appropriate treatment approach for individual cases.

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