A microscopic examination of tissue taken from the affected skin patch is required to make a definitive diagnosis of psoriasis and to distinguish it from other skin disorders. Usually in psoriasis, the examination will show a large number of dry skin cells, but without many signs of inflammation or infection. Changes in the nails typical of psoriasis are often strong indicators of psoriasis.
Distinguishing Psoriasis Patches from Other Disorders. Several conditi...
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