psoriasis

/səˈraɪəsɪs/
noun
  1. A skin condition that causes red, itchy, scaly patches, often on the elbows, knees, and scalp.
    • My doctor prescribed a cream to help control my psoriasis.
    • She has a mild case of psoriasis on her elbows.
    • Psoriasis can be uncomfortable, but it is not contagious.