Clinical spectrum of oral GVHD, ranging from mild, predominantly lichenoid lesions to more severe, ulcerative lesions. (A) Lichenoid changes of the buccal mucosa. Note white striations (arrow). (B) Severe cGVHD of the buccal mucosa. Note pronounced erythema and the presence of ulcerations (arrow). (C,D) Mild and severe changes of the tongue.