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.
Symptoms of boils. A boil starts as a hard, red, painful swelling usually less than 4 cm in size. Over the next few days, the swelling becomes softer, larger and more painful. Soon a pocket of pus forms on the top of the boil (pointing). These are the signs of a severe infection: The skin around the boil becomes infected.