How a scar it formed?
When the skin is traumatic regardless of trauma or surgery, as long as the wound deep dermis, human body will produce scar tissue, the wound recovered it's depend on human body healing mechanism is different, if the wound in the epidermis (0.2mm) it is a regeneration mechanism. The epidermis will grow in the same as the original tissue cells, so do not leave scars but when the cortical injury to the dermis, the healing mechanism belongs to the repair system, the body will produce scar tissue to connect to the wound, however after healed will be remained scar.
当皮肤受到创伤时不管是外伤或手术, 只要伤口深入真皮层, 人体就会产生疤痕组织, 将伤口连接起来. 因为人体对于伤口愈合的机制不同, 如果伤口在表皮层 (0.2mm)属于再生机制, 表皮会长出和原来一样的组织细胞, 所以不会留下疤痕, 然而当皮层伤及真皮层, 則癒合机制就属于修复系统, 人体会产生疤痕组织来连接结伤口, 而产生癒合后留下的疤痕.