Chronic Spontaneous Urticaria (CSU) Poster

Chronic Spontaneous Urticaria (CSU) is a common and distressing skin condition that causes itchy and sometimes painful hives or wheals (raised rash or patches) on the skin with no known obvious cause or trigger.

The rash can be tiny bumps or large raised patches of different shapes and sizes and can affect any part of the body. Sometimes the rash can be accompanied by swelling called angioedema.

To be classed as chronic, the wheals (urticaria) must be present daily for at least six weeks. It is called ‘spontaneous’ when you cannot identify a reason for the symptoms to appear.

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