1, superficial scar: the injury only hurts the superficial layer of epidermis or dermis, which is slightly uneven, often accompanied by different degrees of pigmentation, local soft and flat, and generally has no dysfunction, which can be improved by grinding or dot matrix laser treatment;

2. Hypertrophic scar: Once serious skin injury involves deep dermis, it is possible to form hypertrophic scar. It is characterized by the thickening and protrusion of scar tissue on the skin surface, which is red in the early stage due to congestion, often accompanied by pain and itching. Hypertrophic scars on the joints of the neck and limbs often affect the activities of the joints and must be surgically removed.

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