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Psoriasis is the disorder of the skinPsoriasis is a skin disorder that causes skin irritation which can be persistent and continuous. Psoriasis causes multiplication of normal cells at a very high rate. The cells that lie beneath die and the high volume of cells causes the skin surface to get pinkish red. The red plaques are covered with white scales.The skin trouble is observed on the surfaces of knees, scalp, elbow, soles and palm of individuals.Psoriasis can also cause or be linked with arthritis. Such a disorder is called as Psoriatic arthritis. Such a trouble can cause swellings and pain of the joints.The symptoms of Psoriasis:Toe nail being discolouredFinger nails being discolouredPlaques of skin that may be itchy and painfulCracked plaques that may even bleedWhat are the causes of Psoriasis?According to research, this skin disorder could be an outcome of abnormality in the immune system. Stress can also cause this trouble. Streptococcal infection can also cause the skin disorder. Similar genes acquired through a close member off the family can also cause such a trouble as research indicates that the disorder can run into families. The occurrence of the disease may skip generations. Use of certain drugs can also cause such a disorder. Use of certain drugs can worsen symptoms of psoriasis. Any form of skin injury can also aggravate the occurrence of this skin disease.How is the trouble diagnosed?Doctors would check and examine your skin to learn about the existing symptoms. The disorder may be similar to eczema, hence identifying the trouble may sometimes be difficult. Doctors would remove a small piece of skin under microscope by doing a biopsy. Doctors may even recommend a blood test How is the issue treated?The symptoms of this disorder can be controlled by using medications. At times doctors would use more than one form of treatment to rectify the trouble.