Psoriasis is an obstinate skin condition in which red patches of various sizes develop on the skin that is covered with dry, silvery scales. Psoriasis is a chronic skin disease that got its name from the Greek word meaning, 'itch'. Psoriasis is commonly misspelled as psoriasi, soriasis, psorisis, psorasis, psoraisis. Psoriasis is called as Chhal rog in Hindi In psoriasis the skin becomes inflamed and red eruptions appear on the surface of the skin that begins to itch excessively. These areas form thickened areas (plaques) that are covered with silvery scales over the reddened lesions. The skin at the joints may crack.