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Not to be used for advertising or in a defamatory context .Psoriasis on the chest of a 37 year old pregnant woman. Psoriasis is a condition in which skin cells are produced much faster than normal. The body cannot shed the cells fast enough, resulting in patches (plaques) of scaly, thick skin, which are often itchy and may become infected. Psoriasis is triggered by many factors including emotional stress, some infections or certain drugs, although in many cases there is no obvious cause. Treatment is aimed at the cause, if known. If the cause is not known, then emollient creams, phototherapy and oral medications can be used. This case of psoriasis appeared during pregnancy. (KEYSTONE/SCIENCE PHOTO LIBRARY/DR P. MARAZZI)