Urticaria n. (Med.) The nettle rash, a disease characterized by a transient eruption of red pimples and of wheals, accompanied with a burning or stinging sensation and with itching; uredo.
... to 17%. The observation of Canon is worthy of attention, that the increase of the eosinophils is connected with the degree of extension of the disease, rather than with its nature or local intensity. In a case of acute widely distributed urticaria, A. Lazarus found the eosinophils increased to 60% of the leucocytes, a number which after the course of a few days again ... — Histology of the Blood - Normal and Pathological • Paul Ehrlich
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