The scars caused by increased tissue formation are called keloids or hypertrophic scars. The word hypertrophy means overgrowth. Both hypertrophic and keloid scars are associated with excessive amounts of the cell substance collagen. Overproduction of collagen is a response of skin cells to damage. The excess collagen becomes piled up in fibrous masses, resulting in a characteristic firm, smooth, usually irregularly-shaped scar.
The typical keloid or hypertrophic scar is 1 to 2 millimeters in diameter, but some may be 1 centimeter or larger. Keloid scars tend to genetic—that is, abnormal growth of scar tissue is more likely to occur in susceptible people, who often are people with relatives who have similar types of scars.
Hypertrophic and keloid acne scars can persist for years, but may reduce in size over time.
Scars Caused by Loss of Tissue
Acne scars associated with loss of tissue, similar to scars that appear from chicken pox, and are more common than keloids and hypertrophic scars.
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