on the skin produces an initial red line (capillary dilatation), followed by a flare Axon -reflex widening erythema (arteriolar dilation) and the formation of a linear wheal (transudation of fluid / edema) Lewis called triple response. An exaggerated response to this trend constitutional whealing is seen in about 2-5% of the population and is called dermographism.

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on the skin produces an initial red line (capillary dilatation), followed by a flare axon -reflex widening erythema (arteriolar dilation) and the formation of a linear wheal (transudation of fluid / edema) lewis called triple response. an exaggerated response to this trend constitutional whealing is seen in about 2-5% of the population and is called dermographism.