Turmeric was first used in Ayurvedic medicine 6,000 years ago, according to the book "Turmeric: The Genus Curcuma." Turmeric is now gaining attention in the Western scientific community for the treatment of various conditions, including psoriasis. Curcumin is the active ingredient in turmeric responsible for inhibiting skin growth factors that lead to psoriasis scales, according to Volume 595 of the journal Advances in Experimental Medicine and Biology.
Purchase turmeric in powder form in the spice section of the grocery store or in supplement form at a nutrition store or pharmacy. Turmeric supplements come in capsule form. Pull the capsules apart to access the powder.
Pour 1/4 tsp. or more of turmeric powder in a non-porous bowl (glass, ceramic or metal). That amount is enough to treat a small, quarter-size area. Use more turmeric if treating larger areas of the skin.
Mix enough water into the turmeric powder to make a thick, smooth paste--about the consistency of mud. Pour one drop of water into the turmeric powder at a time, while stirring the mixture with a spoon to remove any lumps. If you accidentally use too much water, add more turmeric powder to obtain the desired consistency.
Spread a thin layer of turmeric paste onto the psoriasis-affected areas of skin, before bedtime. Use enough paste so that you cannot see the underlying skin, but not so much that the paste is falling off.
Wrap a piece of gauze around the skin treated with turmeric paste to keep the paste in place. Leave the turmeric paste on your skin, covered with the gauze, overnight.
Remove the gauze and wash the turmeric paste off of your skin using warm water.