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Scars Caused by Increased Tissue Formation
The scars caused by increased tissue formation are called keloids or hypertrophic scars. The word hypertrophy means “enlargement” or “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 injury. The excess collagen becomes piled up in fibrous masses, resulting in a characteristic firm, smooth, usually irregularly-shaped scar. Hypertrophic and keloid scars persist for years, but may diminish in size over time.

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Healing Acne For Good
Having suffered from acne for 20 plus years, I know that acne brings enormous stress and unhappiness not to mention a total loss of self confidence. Every day, all I could think about was healing acne for good, and having clear skin again.
Source: ezinearticles.com