How does inflammation begin?
It begins as local vascular dilation that permits an increase in blood flow to the tissue. This accounts for redness and warmth. There are changes in permeability and intravascular pressure of the vascular membrane that accounts for swelling within the intersitial space. Many proteins and white blood cells escape (exit out) with the fluid to destroy bacteria, neutralize toxins, destroy dead and dying tissue. Eventually new capillaries facilitate tissue repair.