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How is a Scar formed?

  1. Shedding of dead skin cells

  2. Formation resulting from a lesion extending into the dermis or deeper

  3. Open lesion on the skin surface

  4. Mechanical abrasion of the epidermis

The correct answer is: Formation resulting from a lesion extending into the dermis or deeper

A scar is formed when there is damage to the deeper layers of the skin. This can occur due to a lesion, which is a break in the skin's surface that goes into the dermis or even deeper. The other options, shedding of dead skin cells, an open lesion, and mechanical abrasion of the epidermis, do not involve damage to the deeper layers of the skin and therefore do not result in the formation of a scar.