Walnut oil has a history of traditional use in the management of various skin conditions, including psoriasis. Its application is largely derived from folk medicine practices where it is valued for its emollient properties, which help in moisturizing dry, scaly skin—an important aspect of psoriasis care. Walnut oil contains polyunsaturated fatty acids, primarily linoleic and alpha-linolenic acids, as well as antioxidants such as vitamin E, which may contribute to maintaining skin barrier function and reducing inflammation when applied topically.

However, despite these theoretical benefits and traditional applications, scientific validation for walnut oil's efficacy specifically in the treatment or management of psoriasis is limited. There are no high-quality clinical trials or robust scientific studies directly investigating its effects on psoriasis. Some in vitro and animal studies have shown anti-inflammatory or wound-healing properties of walnut oil, but these findings have not been reliably translated into human clinical practice for psoriasis.

In summary, while walnut oil continues to be used in traditional medicine for skin conditions and may offer symptomatic relief due to its moisturizing and mild anti-inflammatory effects, there is insufficient scientific evidence to strongly support its role in treating or managing psoriasis.