To fight any foreign organism present in one area, the body resorts to increasing the blood supply to this area. Increasing the blood supply in the infected area delivers more white blood cells that fight the infection in that area. It can also help decrease the concentration of toxins in that region. The chemical mediators produced in the area of infection cause dilation of the blood vessels supplying it. This vasodilation brings more blood to the infected area and makes it look red and hot.

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