My son has erythema multiforme minor and looks and feels terrible. what will help him?

Meds,cool bath: Emm will often take a while to peak in its intensity given the variable trigger (food, illness) & during that period anti-histamines may help suppress a wider breakout and itching. Often i rx with a short course of an anti-inflammatory steroid orally (injection works faster). Avoid hot baths or trips outside in the summer heat. Ibuprofen sometimes helps the grumpiness.