多形性红斑是一症候群,可在粘膜和皮肤发生损害,病损形态多种多样,病程长短不一,可单发于口腔,也可合并皮肤及其他孔窍器官损害。病因尚不完全明瞭,多认为体内外不明因素引起的一种过敏反应。 Erythema erythema multiforme is a syndrome, mucosal and skin lesions can occur, a variety of lesion morphology, duration of disease can be in the mouth alone, but also with the skin and other organs or organ damage. The etiology is not yet fully understood, and many believe that the unknown factors in vivo caused by an allergic reaction.