All are precancerous lesions of oral cavity except: (A) Leukoplakia, (B) Erythroplakia, (C) Diffuse oral submucous fibrosis, (D) Diffuse aphthous ulcers
Answer is D. Premalignant Lesions - Leukoplakia Erythroplakia Oral submucous fibrosis Melanosis and mucosal hyperpigmentation Ref: Dhingra; Textbook of Ear, Nose and Throat; 7th Edition; Page 253