It is a genetically programmed chronic inflammatory skin condition which is characterized by red patches, scaling, itching & sometime bleeding also. In psoriasis skin cell multiply up to 10 times faster. Although psoriatic skin rash tend to occur on knee, elbow, scalp, nail, palm and sole but they can involve whole body. There are several trigger factors which can aggravate psoriasis like infection, trauma, stress, pregnancy and certain drugs. In 15-25% cases it is associated with inflammation of joints, called psoriatic arthritis.