For how to diagnose psoriasis, most patients are diagnosed through clinical manifestations, typical rashes, such as layers of scales on top of erythematous spots, seeing punctate hemorrhages after scraping off the scales, and combining with family history, it is not difficult to diagnose. How should the care, first of all, we should clearly know that psoriasis is a kind of immune system and other multi-factors lead to the disease, infection, psychological stress, external drug stimulation can lead to the onset of the disease. In terms of nursing, we should strengthen the exercise, avoid upper respiratory tract infection, keep the mood happy, avoid anxiety, avoid the abuse of drugs, such as stimulation of strong drugs and so on. Pay attention to bathing diligently, avoid overheating of water temperature, avoid excessive scrubbing, and apply moisturizer after bathing.