Erosive lichen planus (ELP) affecting mucosal surfaces is a chronic autoimmune disease of unknown aetiology. It is often more painful and debilitating than the non-erosive types of lichen planus. Treatment of erosive lichen planus is difficult and aimed at palliation rather than cure. Several topical and systemic agents have been used with varying results. Another Cochrane review has already assessed interventions for lichen planus affecting the mouth.