Musculoskeletal and Skin: Osteoporosis, Psoriasis · USMLE Step 1

Which of the following nail findings is MOST specific for psoriasis?

  1. Transverse horizontal ridging
  2. Distal nail onycholysis
  3. Oil-drop discoloration
  4. Spoon-shaped koilonychia
Show answer and explanation

Correct answer: Oil-drop discoloration

Oil-drop (salmon patch) discoloration is highly characteristic of psoriatic nail involvement. It reflects nail bed inflammation.

Difficulty: Medium Question 16 of 20

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