<prompt> All are precancerous lesions of oral cavity exceptLeukoplakiaErythroplakiaDiffuse oral submucous fibrosisDiffuse aphthous ulcers  <response>: Premalignant Lesions - Leukoplakia Erythroplakia Oral submucous fibrosis Melanosis and mucosal hyperpigmentation Ref: Dhingra; Textbook of Ear, Nose and Throat; 7th Edition; Page 253 