Does the button scab leave scar without bleeding?

Human skin is composed of epidermis, dermis and subcutaneous tissue and connected with its underlying tissue, adult skin different parts, the thickness of the skin is not the same, excluding subcutaneous tissue, eyelids, breasts and limbs of the curved side of the skin is thinner, palms and limbs stretch side of the skin is better thick epidermal layer is divided into five layers: cuticle, granular layer, spinous cell layer, transparent layer and basal layer. If there is no bleeding after the scab is removed and the skin lesion does not exceed the basal layer of the epidermis, there will generally be no scar; if the skin lesion is removed beyond the basal layer of the epidermis and reaches the dermis, a scar may be left.