Assertion: nail psoriasis | /r/HasProperty | characterized by yellow-red nail discoloration
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text: Nail psoriasis is characterized by yellow-red nail discoloration (also called an oil drop or salmon patch), nail pitting, areas of white on the nails (leukonychia or midmatrix disease), skin thickening under the nail (subungual hyperkeratosis), nail loosening from the fingertip (onycholysis), horizontal lines across the nail (Beau lines), redness of the half moon area at the base of the nail (spotted lunula), crumbling and brittle nails, and small black lines in the nail.