Psoriasis is an auto-immune disease that causes skin cells to build on top of one another and create patches of red, bumpy and scaly skin. The build-up of skin cells occurs as a result of being attacked by the T cells in the body, causing the healthy cells to replicate more frequently than normal. The condition comes in many different forms, including plaque, guttate, inverse, pustular and erythrodermic psoriasis, and each type can create significant discomfort, both physically and emotionally, for those who have it. There is no cure for psoriasis, but treatments are available that target its symptoms. Topical retinoids, corticosteroids or vitamin D creams can limit inflammation and skin cell growth. Other methods include oral medications, laser therapy and avoiding substances that catalyze the condition.