Psoriasis is a non-contagious, lifelong skin disorder. The most common form being plaque psoriasis. It appears as raised red scaly patches with silvery scales that form most often on the scalp, elbows, knees or lower back. Topical therapies are useful in controlling mild and moderate cases of this chronic skin condition. Systemic drugs such as Otezla, Acitretin and biologic agents such as Embrel, Humira, Stelara, Tremfya, and Costentyx are used for more severe cases. Patients can also be treated with light therapy (UVB), and laser (excimer).