History: Unilateral laterothoracic exanthem(ULE), also known as asymmetric periflexural exanthem of childhood, is characterised by an acute erythematous macular and papular eruption localized in an asymmetric unilateral fashion over the upper trunk, axilla and proximal upper extremity.   The disorder seems to predominate in females and appears at a mean age of approximately two years.  The exact cause of ULE remains unclear although an infectious etiology has ben hypothesized.  The eruption usually lasts four to six weeks, followed by spontaneous resolution; it responds minimally to topical corticosteroids and disappears without sequelae.