Background: Papulosquamous skin diseases are amongst the most important dermatological lesions because of their high prevalence. Clinical and histopathological distinction of each of them is of paramount importance because of different treatment modalities and prognosis. Aim: To analyse and classify the cases with non infectious erythematous papulosquamous lesions; psoriasiform and lichenoid dermatitis based on histomorphological characteristics. Materials and Methods: In present study 100 cases of noninfectious erythematous papulosquamous skin disorders were histopathologically examined to analyse the characteristic features in psoriasis and lichenoid dermatitis. Study was done for a period of one and a half year from March 2015 to July 2016. Results: Out of 100 cases of papulosquamous lesions, we encountered 80 cases with histomorphological features consistent with Lichen planus (44%) and psoriasis (36%). These features were analysed and correlated with the clinical diagnosis. Conclusion: Psoriasis and Lichen planus comprise the bulk of papulosquamous skin disorders (80/100 cases). The age group of 2140 years was most frequently involved with both the disease showing male preponderance. The present study signifies the advantage of coherent use of clinical examination and histopathological study in making an accurate diagnosis.

Keywords: Papulosquamous; Erythematous; Lichen Planus; Psoriasis; Histopathology.