Eruptive hypomelanosis in a child, a new viral exanthem.

A 6-year-old boy presented with sudden onset of progressive, asymptomatic crops of well-demarcated, symmetrical, hypomelanotic macules ranging in size from 0.1 to 0.5 cm [Figures 1-3]. The eruption appeared in crops and began on the forearms and then spread to legs and thighs and face over a period of 1 week. Most lesions were non-scaly and discrete. Some closely situated macules showed confluence. After the progressive eruption involved all four extremities and the cheeks, the rash appeared to stop progressing further. The trunk, palms, soles and mucosa were spared. He had a transient episode of coryza and mild fever for 10 days before onset of the eruption for which no treatment was sought. Apart from mild congestion of the throat, the remainder of the physical examination was normal.