Biologic drugs . Biologics contain human or animal proteins and can block certain immune cells that are involved in psoriasis. They’re usually recommended for people with moderate to severe psoriasis and are administered via an injection or IV infusion. There are currently three types of biologics that can help treat psoriasis, all of which block immune system chemical messengers that promote inflammation called cytokines. The three types of biologics block the cytokines tumor necrosis factor alpha (TNF-alpha), interleukin 12, interleukin 23, and interleukin 17-A (IL-12, IL-23, and IL-17A, respectively).
At the edge of Israel's Dead Sea, there are a group of resorts that cater to psoriasis patients by offering a combination of graded solar exposure and the application of crude coal tar along with a spa-like experience. The Dead Sea is the lowest point on earth, more than 400 meters below sea level. Once the sun's rays pass through the haze, the harmful ultraviolet rays are filtered out and the remaining rays are highly effective in treating psoriasis. For those with the time and the money, this is a reasonable alternative to standard medical treatment.
Two major immune system genes under investigation are interleukin-12 subunit beta ( IL12B ) on chromosome 5q , which expresses interleukin-12B; and IL23R on chromosome 1p, which expresses the interleukin-23 receptor, and is involved in T cell differentiation. Interleukin-23 receptor and IL12B have both been strongly linked with psoriasis.  T cells are involved in the inflammatory process that leads to psoriasis.  These genes are on the pathway that upregulate tumor necrosis factor-α and nuclear factor κB , two genes involved in inflammation.  Recently, the first gene directly linked to psoriasis has been identified. A rare mutation in the gene encoding for the CARD14 protein plus an environmental trigger was enough to cause plaque psoriasis (the most common form of psoriasis).