Abstract
The term "urticaria factitia" is applied to wheals produced on the skin by local physical or mechanical irritation, such as stroking, scratching, rubbing and other forms of irritation, either in urticarial patients or in persons who possess "an irritable or susceptible skin." These wheals are limited to the site of the trauma, and are in reality amplified dermographic impressions which have been made on the skin. The expressions "dermographism," "autographism" or "dermographic urticaria," although originally applied to wheals induced by traumatizing the skin in nervous and hysterical patients, are today almost universally employed as terms synonymous and interchangeable with urticaria factitia, and are so used in this paper. Dermographism is a frequent accompaniment of urticaria and may persist long after the urticaria has gone. It may, however, occur alone or occasionally in association with pruritus, and its discovery may only be accidental. The old teachings (still adhered to by some
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