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A scar is a mark left on the skin or epithelial tissue where a wound has not completely healed and fibrous connective tissue has developed. They form when the dermis is damaged. The body forms new collagen fibers from the basal layer to fix the damage. Skin wound healing is when the skin can reconstruct itself completely, whereas when the wound healing process is interrupted, it could lead to scar formation. The basement membrane in interrupted wound healing would not release enough keratinocytes to fully fix the skin, just enough to close the wound up and leave behind a scar.
3) Skin layers. Chapped skin is the development of breaks in the skin due to a mixture of specifically dry and scaly skin and being exposed to cold weather or strong winds. Lack of humidity in the air during the winter is also known to cause chapped lips; likewise, sun exposure is worse and the saliva in your mouth also causes more