The Latin name for Oregon grape root is Mahonia aquifolium. Topically, it can help slow the excessive production of skin cells that occurs with psoriasis.
Oregon grape has a constituent called berberine that helps fight bacterial and fungal infections. It also treats acne, eczema, staph, and herpes. Use it internally and externally.
The flower essence could help someone with psoriasis, because it is used to treat self-criticism and helps you to love and accept yourself. Avoid in pregnancy, hyperthyroid conditions, and in cases of excessive gas.