Final answer:
Psoriasis is a skin disease that causes itchy or sore patches of thick, red skin with silvery scales. It commonly affects areas such as elbows, knees, scalp, back, face, palms, and feet. Psoriasis occurs due to an accelerated process of cell turnover.
Step-by-step explanation:
Psoriasis is a skin disease that causes itchy or sore patches of thick, red skin with silvery scales. It commonly affects areas such as elbows, knees, scalp, back, face, palms, and feet. The condition is a result of the complex interplay between keratinocytes, dendritic cells, and T cells, and the cytokines produced by these cells. Psoriasis occurs due to an accelerated process of cell turnover, causing skin cells to rise to the surface too quickly.