What is a key characteristic of keloids?

A key characteristic of keloids is that they are raised scars that develop as a result of an overproduction of collagen during the healing process after an injury or surgery. Keloids are unique because they extend beyond the original boundaries of the wound, often continuing to grow even after the initial healing has occurred. This overgrowth can lead to significant elevation above the surrounding skin, distinguishing keloids from other types of scars.

Keloids can vary in color and texture, but they generally present as smooth, firm, and raised areas on the skin, which can sometimes cause discomfort or sensitivity. The notable aspect of keloids is their tendency to persist or expand over time, unlike normal scars, which typically remain within the area of the original injury and do not grow continuously.

In contrast, other conditions described in the options do not share this characteristic. Fluid-filled bumps refer to cysts or blisters, while deep indentations relate to atrophic scars. Temporary changes in skin pigmentation indicate variations in melanin production and are not primarily associated with the abnormal collagen formation that characterizes keloids. Understanding this distinctive feature of keloids is essential for effective skin care and treatment options.