<prompt> Which of the following is not a premalignant condition oral cancer?LeukoplakiaErythroplakiaOral submucous fibrosisSystemic Sclerosis  <response>: Lesions with an increased risk of malignancy on oral cancerPremalignant condition:- Leukoplakia, Erythroplakia, speckled erythroplakia, chronic hyperplastic candidiasisConditions increasing risk:- Oral submucous fibrosis, syphilitics glossitis, sideropenic dysphagia Peterson Kelly syndromeThe risk is doubtful:- Oral lichen planus, DLE, Dyskeratosis congenital.Ref: PL Dhingra, Diseases of Ear, Nose Throat, 7th edition, pg no. 253 