Anyone had any experience with Erythema multiforme? 18 month DS has had it twice now from head to foot. Doctor says it's an allergic reaction but we can't figure out to what. Has not taken any medication but has just recovered from winter vomiting bug, and information sourced online says it can follow an antecedent infection. Have been giving him piriton and calpol (when he gets hot) and applying calamine lotion. It looks quite shocking although he's been in good spirits. Not sure whether it's something we'll just have to live with or if treatment is available?