The present invention is a pharmaceutical composition for the prevention or treatment of skin diseases comprising the extract of the barberry tree or a fraction thereof, a method of treating a skin disease comprising the step of administering a pharmaceutical composition to an individual, an improvement of the skin disease comprising the tree barberry extract or a fraction thereof It relates to a pharmaceutical composition for the prevention or improvement of skin diseases comprising a food composition, a pod tree extract or fractions thereof, and a cosmetic composition for the prevention or amelioration of skin diseases containing the pod tree extracts or fractions thereof. Chopop tree extract of the present invention has no side effects, but it was confirmed that it can effectively treat skin diseases such as psoriasis, so the jopop tree extract of the present invention may be widely used for prevention or treatment of various skin diseases.
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