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Scars are formed on the skin after the healing of the wounds caused by accident, trauma, burns or surgery. The scars look like fibrous tissue over the skin, and the size of the scar is correlated to the wound size. Skin disorders like acne and infections like chicken pox can also produce scars on the skin. The collagen fibers are formed over the wound and gradually a fibrous tissue is formed over the skin; but these tissues do not possess the qualities of skin.