Describe the difference between localized and generalized pruritus.

Pruritus occurs with a host of dermatologic conditions, or it can mark systemic disease. Some dermatologic conditions that cause pruritus are inconspicuous or nonspecific. Other dermatologic conditions are apparent on physical exam. A physician must differentiate between localized and generalized pruritus and know a variety of skin diseases that cause pruritus. Localized pruritus is defined as itching focused to certain regions. Localized pruritus usually results from a regional infection or dermatosis. Generalized pruritus typically appears as itching that affects the entire body surface. It implies a dermatologic or systemic disorder. Generalized pruritus can be distinguished as acute or chronic. Chronic pruritus is defined as lasting 6 or more weeks.