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The itchy sensation you feel when a wound heals is coming from sensitive nerve cells that are reacting to both chemicals being released and structural stretch on the surrounding skin and wound tissue.
Not all wounds bleed. For example, burns, some puncture wounds, and pressure sores don't bleed. Once the scab forms, your body's immune system kicks in to protect the wound from infection. 1  The wound becomes slightly swollen, red or pink, and tender.  You also may see some clear fluid oozing from the wound. This fluid helps clean the area.