Diagnosis of Nettle rash

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Clinical diagnosis is made by examination of the skin rash.

The diagnosis of the cause is made after a systematic case history. If an allergic reaction is suspected a skin test (skin prick test) or a specific blood test may be needed. A specialist in skin or allergic diseases should carry out these tests.

It is rare for allergy to be the cause of chronic urticaria so routine allergy tests are not usually necessary. It may be necessary to rule out other disorders such as endocrine disorders, malignancy, lupus, other allergic disorders, etc.