write 5 pages for Pre-malignant lesionsA) LeukoplakiaB)palatal reverse smokersC)Erythroplakia write 5 pages for pre-malignant conditionsA) Oral submucous fibrosisB)

write 5 pages for Pre-malignant lesionsA) LeukoplakiaB)palatal reverse smokersC)Erythroplakia  write 5 pages for pre-malignant conditionsA) Oral submucous fibrosisB) Lichen planusC) Lupus erythematous Explain the following in detail based on its etiology , clinical features, classifications , histopathological features.