What type of scar forms due to the excessive growth of fibrous tissue?

The type of scar that forms due to the excessive growth of fibrous tissue is known as a keloid. Keloids occur when the body produces too much collagen during the healing process, resulting in a raised, thick scar that often extends beyond the original wound site. This overproduction is typically more pronounced in certain individuals and can lead to distinctively large and prominent scars that may be itchy or painful. Keloids are often more common in people with darker skin tones and can sometimes be difficult to treat or manage, as they may recur after removal.

In contrast, crust refers to the hardened surface layer that forms over a site of injury or infection, not a scar. A general scar is a healing mark that results after the skin has been injured, but it does not imply the excessive growth characteristic of keloids. An ulcer represents a different kind of skin issue, where there is a loss of continuity of the skin or mucous membrane due to a variety of causes, rather than a scar formation. Therefore, the keloid is clearly distinguished by its unique formation due to fibrous tissue overgrowth.