Boil is a localized collection of pus surrounded by inflamed tissue in the skin. It starts off as reddened tender area and over a period of time, the area around it becomes firm and hard. The center of the boil full of pus is soft and is filled with infection fighting white blood cells, bacteria and proteins that eradicate the infection. Finally the pus forms a head, which can be surgically opened or drained out through the surface of the skin.
One can not pinpoint the rea…