By Angela Palmer, About.com
Updated: December 12, 2007
About.com Health's Disease and Condition content is reviewed by the Medical Review Board
Hypertrophic Acne Scar
Image © Angela PalmerRaised scars caused by an overproduction of collagen. A hypertrophic scar looks like a raised, firm mass of tissue. Keloids are a form of hypertrophic scarring. They occur when scar tissue grows beyond the borders of the original wound.
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