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.
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 germ (bacterium) called Staphylococcus aureus. A boil looks like a small red lump on the skin that is tender.