Sweet's syndrome is a skin disorder marked by fever and painful skin lesions.


The distinctive skin lesions are the most obvious sign of Sweet's syndrome, and they seem to appear suddenly as a series of small red bumps that quickly increase in size. These bumps, also called plaques, may grow to be 1 centimeter in diameter or larger. Plaques typically appear on the back, neck, arms and face. These tender and painful eruptions may develop blisters, pustules or ulcers, causing the skin to burn or itch


If left untreated, Sweet's syndrome not associated with a malignancy may disappear on its own within one to three months. In contrast, the right treatment may improve the skin lesions and associated symptoms significanltly in just two or three days, with the worst of the lesions disappearing within one to four weeks.


The cause of Sweet's syndrome is generally impossible to determine (idiopathic). But in some cases, it may be the body's immune system reacting to some bodily disorders.


Sweet's syndrome may be diagnosed by the distinctive rash, blood tests, and tissue samples.