Idiopathic Lympho-Plasma Cellular Mucositis; A Diagnostic Predicament.

The term "idiopathic lymphoplasmacellular mucositis" (ILPM) refers to a set of conditions marked by extensive lymphocyte and plasma cell infiltrates in the submucosa which can involve the oral cavity, upper respiratory tract and the genital epithelium. There is no recognized cause of ILPM, and the diagnosis is mostly done on an exclusion basis. Herein, we report a 32-year-old man presented with an erosive ulcerated lesion on the hard palate and review the literature regarding the possible differential diagnosis including squamous cell carcinoma. We also reviewed the previously reported cases of ILPM with palatal involvement to summarise clinical presentation, treatment, and outcome of the entity to date.