What causes psoriasis?

Why does one develop psoriasis?

Unfortunately we do not know why this serious skin disorder occurs. However, there are certain risk factors that increase the risk of you developing the disorder. 

If you have a family history of psoriasis in the family, then there is a good chance you may develop it also. About 40% of people with psoriasis have a positive family history

 It is now believed that certain viral and bacterial infections may also increase the risk of developing psoriasis. Individuals with HIV are more likely to develop psoriasis than the general population. People who develop strep throat are also at an increased risk.

 While stress does not cause psoriasis, it can certainly aggravate the disorder. 

Obese individuals are at a higher risk of developing psoriasis than thin people. In obese individuals, the psoriatic plaques often develop in the skin creases and folds (also known as inverse psoriasis).

In general, the majority of disorders or diseases in medicine are simply due to bad luck.