Shirley has a chronic skin condition in which she has dry, scaly red patches that are very itchy. Her symptoms are mostly found on her scalp, elbows, and knees. What condition does Shirley most likely have?

Psoriasis commonly causes chronic, itchy, dry, scaly red patches, especially on the scalp, elbows, and knees. Eczema can also cause itchy patches, but the characteristic locations and thick scaling described point most strongly to psoriasis.

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