Each kidney contains about one million tiny units called nephrons. Each nephron is made up of a very small filter, called a glomerulus, which is attached to a tubule. As blood passes through the nephron, fluid and waste products are filtered out.
Early Warning: Folliculitis. Folliculitis is an inflammation or infection of the hair follicles that can develop into a boil. Tiny pimples with whiteheads appear around individual hairs, sometimes surrounded by red skin. It can be itchy, tender, and uncomfortable, but is typically not as painful or deep as a boil.
In most cases, boils need to drain before it starts healing. From its initial occurrence on your body skin, boils may take 3 to 4 days to burst, followed by drained contained pus. Only when it is completely drained that a boil and the skin around it starts to eventually heal.