You could test a little amount on a tiny patch of skin, such as your collarbone or inner arm. Plant oils that are rich in nutrients are the best thing to get rid of psoriasis. Argan oil is a very popular natural oil for psoriasis. It is harvested from argan trees. This oil will help reduce redness and irritation on your skin. Make sure you're wearing sunscreen every single day. The sun's rays are harmful and can lead to you getting sun spots, wrinkles, blotchy skin, premature aging and freckles.