Abstract
The lichenoid reactions are one of the most prevalent pathological reaction patterns of the oral mucosa. Oral lichen planus (OLP), lichenoid contact reactions (LCR) and graft‐versus‐host disease belong to this group of lichenoid reactions. Apart from a common clinical appearance, these disorders cannot be discriminated from each other by the use of histopathological techniques. New knowledge about the etiology behind LCR and GvHD can also, to some extent, be extrapolated to the immune mechanisms, which participate in the pathogeneses of OLP. Besides a discussion on different etiological aspects of OLP, this presentation will focus on treatment strategies used to manage lichenoid reactions. During recent years a debate has been conducted on the malignant potential of lichenoid reactions.
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