(Clinical features) Common sites are ■ Buccal mucosa a Dorsum of tongue Gingiva p Palate Lesions usually bilateral and often symmetrical Cutaneous lesions only occasionally associated a Usually good response to corticosteroids Department of Oral Pathology, Shandong UniversityDepartment of Oral Pathology, Shandong University 7 【Clinical features】 Common sites are:  Buccal mucosa  Dorsum of tongue  Gingiva  Lip  Palate Lesions usually bilateral and often symmetrical Cutaneous lesions only occasionally associated Usually good response to corticosteroids