Treatment of psoriasis it is a chemical of plant origin taken from the bark of the south american araroba tree dithranol in lassars paste a salicylic acid and zinc oxide paste developed by german dermatologist oskar lassar is used most successfully for hospital inpatients the use of dithranol is not without drawbacks it can stain both skin and clothing and can burn non affected skin if . The mainstay of psoriasis treatment steroid creams decrease inflammation relieve itching and block the production of cells that are overproduced in psoriasis stronger preparations which are. Psoriasis treatments aim to stop skin cells from growing so quickly and to remove scales options include creams and ointments topical therapy light therapy phototherapy and oral or injected medication which treatments you use depends on how severe the psoriasis is and how responsive it has been to previous treatment. Treatments are not just confined to taking a pill or potion but depending on your circumstances and the view of your healthcare provider might include the following topical applied to the skin such as creams and ointments systemic taken internally such as tablets liquids for pain relief and disease modifying