most cases, psoriasis is diagnosed solely on the basis of physical examination. Your doctor recognizes the
disease by observing the nature and location of the symptoms. During the examination, the dermatologist may
scrape the areas affected with the psoriasis with a wooden spatula to loosen and remove the scales.
there are complications, your dermatologist can take a small sample of your skin to be examined under a
microscope (biopsy) to rule out other skin conditions that have symptoms similar to psoriasis:
skin cancer, etc.