Psoriasis may be one of the oldest recorded skin conditions. It was probably first described around 35 AD. Some evidence indicates an even earlier date. Plaque psoriasis is the most common type of psoriasis. About 80% of people who develop psoriasis have plaque psoriasis, which appears as patches of raised, reddish skin covered by silvery-white scale. These patches, or plaques, frequently form on the elbows, knees, lower back, and scalp. However, the plaques can occur anywhere on the body. Unlike skin conditions that are the result of external causes, psoriasis is an autoimmune disorder.

Those with mild psoriasis can get some relief from shampoos and skin care lotions containing coal tar, and oil fashioned home remedy that still works well for little cost. The newest treatment for autoimune disorders is ingectable biologics (Enbrel (etanercept)), that depress the immune system. These treatments are costly, and come with many concerns about side effects.

The holistic herbal approach to psoriasis treatment considers not just cooling herbal oils and salves to treat the dry, itchy scales, but the use of herbs like Oregon Grape, and Sarsaparilla as a blood purifiers.