A rare case of plasma cell mucositis in a young patient.

Plasma cell mucositis (PCM) is a rare benign proliferative disorder affecting various mucosal surfaces usually seen in elderly patients. In the present case, a 13-year-old young boy reported with the complaint of swollen upper lip and enlarged gums in relation to upper front teeth. The diagnosis of plasma cell mucositis is complex and frequently requires histopathological examination and immunohistochemistry.