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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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Get Rid of a Pimple – Easy and Simple
Acne sufferers need to beware that they are not being told the whole truth about getting clear skin and that is why you continue to face the battle against the ugly red blemishes that fill your face and body. Being an acne survivor myself I know how it feels to wake to gaze into a mirror only to see whiteheads and blemishes staring back at you.
Source: ezinearticles.com