<prompt> All are precancerous lesions of oral cavity except -LeukoplakiaErythroplakiaDiffuse oral submucous fibrosisDiffuse aphthous ulcers  <response>: Lesions with an increased risk of malignancyPremalignant condition : - Leukoplakia, Erythroplakia, Speckled erythroplakia, chronic hyperplastic, candidiasis.Conditions increasing risk : - Oral submucous fibrosis, syphilitic glossitis, sideropenic dysphagia Paterson Kelly syndrome.The risk is doubtful: - Oral lichen planus, DLE, Dyskeratosis congenita. 