Boils are red, pus-filled bumps that form under the skin, and the surrounding skin may also be red and painful. Boils are often painful and grow larger until the pus drains or is absorbed by the body. If drainage is deemed necessary, your doctor will make a small incision in the boil, use sterile gauze to absorb and remove the pus in a sterile environment. You can also apply home remedies for boils according to the following article.