A chronic skin disease,usually marked by itchy,scaly,red patches covered by silvery gray scales,is known as:

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Psoriasis is a chronic skin disease that is typically characterized by itchy, scaly, red patches covered by silvery gray scales. Vulgaris is not a skin disease but simply means "common," melanoma is a type of skin cancer, xeroderma refers to dry skin, and erythema is a redness of the skin often associated with inflammation or irritation.

A Chronic Skin Disease,usually Marked by Itchy,scaly,red Patches Covered by Silvery