The simultaneous occurrence of urticarial dermographism in monozygotic twins is reported. Studies suggested successful passive tranfer with sera. A simple device for estimating the pressures necessary to induce whealing is described. Preliminary results indicate that persons who urticate at a pressure of 32 gm/sq mm or less are clinically symptomatic. Hydroxyzine treatment was effective.
BART RS, ACKERMAN AB. Urticarial Dermographism: Report of Occurrence in Identical Twins: A Method for Quantitating Urticarial Skin Sensitivity. Arch Dermatol. 1966;94(6):716–719. doi:10.1001/archderm.1966.01600300040008
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