SULFA DRUGS. One of the more common drug allergies is that to sulfa drugs. Sulfa drugs are more appropriately labeled sulfonamides and are derivatives of para-amino benzoic acid. The table below lists common medications that contain a sulfonamide component.
A boil is a common, painful infection of a hair follicle and the surrounding skin. It begins as a red lump, then fills with pus as white blood cells rush in to fight the infection. Good home care can often clear up a single boil, also known as a skin abscess. A doctor's care is needed when a boil resists treatment or develops in certain vulnerable areas of the body.
In this Article. A boil is a skin infection that starts in a hair follicle or oil gland. At first, the skin turns red in the area of the infection, and a tender lump develops. After four to seven days, the lump starts turning white as pus collects under the skin. 1  The most common places for boils to appear are on the face, neck, armpits, shoulders, and buttocks.  If several boils appear in a group, this is a more serious type of infection called a carbuncle.