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1. Immune system problem that causes skin cells to grow faster than usual. In the most common type of psoriasis, known as plaque psoriasis, this rapid turnover of cells results in dry, scaly patches.
2. Genetics and environmental factors.
3. Infections, such as strep throat or skin infections.
4. Weather, especially cold, dry conditions.
5. Injury to the skin, such as a cut or scrape, a bug bite, or a severe sunburn.
6. Smoking and exposure to secondhand smoke.
7. Heavy alcohol consumption.
8. Certain medications — including lithium, high blood pressure drugs and antimalarial drugs
9. Rapid withdrawal of oral or injected corticosteroids.
10. Family history. The condition runs in families. Having one parent with psoriasis increases your risk of getting the disease. And having two parents with psoriasis increases your risk even more.