Which of the following produces pre-malignant lesions -
Psoriasis
Erythema multiforme
Lichen planus
All of the above
Ans is 'c' i.e. Lichen planus "Oral LP, particularly the erosive (ulcerative variant) is prone to develop SCC, the frequency being 0.8%. Long standing disease and concurrent use of tobacco are the risk factors for malignant transformation. Tongue is the most common site for malignancy, followed by buccal mucosa." - IADVL text book of dermatology 3rd/e p. 1074
Photosensitive Disorders