Assertion: psoriasis's treatment | /r/HasProperty | depend on location
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text: The treatment of psoriasis depends on its severity and location, and can be divided into four main categories: topical treatments (creams or ointments applied directly to the skin), ultraviolet light therapy (also called phototherapy, delivered in hospital dermatology departments), systemic medications (medicines that work inside your body) or biologic treatments (medicines based on compounds made by living cells).