Sometimes a scar develops, while other times your skin heals well. Whether a scar develops depends on how deeply damaged your skin is.
In case of damage to the epidermis, such as an abrasion, there are no scars. Only when the dermis is also affected will your skin recover with a scar after the wound has healed. A scar is nothing more than collagen, the connective tissue of your body. When your dermis is damaged, no 'skin' will return, but a piece of connective tissue.
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