Another Federal Drug Administration approved agent for the treatment of mild psoriasis is coal tar. This treatment comes from tar made from coal and wood, such as juniper and pine. Coal tar works to treat psoriasis by slowing the growth of skin cells, improving the affected skin's appearance, eliminating inflammation and reducing scaling.
When deciding which kind of coal tar to use, take into account the concentration of tar. Coal tar with a greater concentration of tar will generally be more effective.
Before using coal tar, be sure to test it on a small patch of skin. If your skin becomes red, moisturize the psoriasis area before you apply the coal tar. Coal tar also can cause skin to become more sensitive to the sun, so be sure to use sunscreen and limit your sun exposure when using this treatment.