A chronic skin condition that causes red, scaly patches on the skin, often itchy or painful.
From Greek 'psora' (itch) + '-iasis' (a condition). The Greek root means 'to itch,' which describes the main symptom of this disease.
Psoriasis is an autoimmune disease, which means your own immune system attacks healthy skin cells, and it's been documented in ancient texts—Hippocrates wrote about it—yet we still don't have a complete cure, showing how some diseases have haunted humanity forever.
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