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.
1 Boils are infected hair follicles that look like red, raised bumps on the skin. They can be painful, but they eventually go away once they burst and release fluid.  Cold sores are red, fluid-filled bumps that form around the mouth or other areas of the face, which can burst.