Research shows that one’s immune system plays an important role in regards to psoriasis. It seems that the immune system mistakenly activates a type of white blood cell called a T-cell. Once activated, the T-cells trigger a reaction that causes the skin cells to proliferate too fast. These skin cells do not easily fall from the body, so they accumulate on the surface of the skin and create silvery scales.
Despite its appearance, psoriasis is not contagious. People with psoriasis may have a relative who has psoriasis, (not necessarily). However, this does not mean that everyone who has a family member with psoriasis will have this disease.