A boil (furuncle) is an infection of a hair follicle. (Most of the skin is covered with tiny hairs that grow out of hair follicles.) It is usually caused by a bacterium (germ) called Staphylococcus...
Boils can be very painful. I have had a few in my life time. I always heat a small wet towel in the microwave but do not let the towel get to hot. You don't want to burn yourself. Apply the warm...