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A boil is a red and painful sore under the skin that collects and is filled with pus. The center turns white as pus collects within the boil. After several days, the center of the sore becomes thin and breaks open and drains.
There are about 35 trillion red blood cells circulating in the body of an adult human being and these are really so many red stuff in blood that it naturally dominates the general color out look of a blood sample.