Dermoscopic Demonstration of Darier Sign

Abstract

A 9-month-old child presented with a 3-month history of a solitary hyperpigmented plaque having a leathery surface and a peau d’orange appearance located on the inner aspect of left forearm (Figure 1A), dermoscopically characterized by a pigment network on a yellow background (Figure 1B). Urtication of the lesion upon scratching (Darier sign) was evident (Figure 1C) and decreased pigment network density and yellow hue intensity on dermoscopy. (Figure 1D). Histopathology was consistent with mastocytoma (Figures 1, E and F). Teaching Point