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Guttate psoriasis. Close-up of skin lesions on the back of a 60-year-old male patient with guttate psoriasis. 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. Guttate psoriasis causes small lesions rather than usual large patches in psoriasis. It is classically triggered by a bacterial infection, usually an upper respiratory tract infection.
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