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Psoriasis is a lasting skin condition that causes cells to build up quickly on the surface of a person's skin. The extra cells cause thick, red, raised, itchy areas of skin covered with scales.
Psoriasis often begins in early adulthood but can also start later in life. The condition often comes and goes, becoming more serious and then less so. The condition is not contagious and usually occurs on a few areas of skin, but it can cover large areas of the body in severe cases. The exact cause of psoriasis is still unknown, but it's thought to be related to an immune system problem with cells in the body. These factors can increase a person’s risk for the disease:
Psoriasis usually starts or gets worse because of a specific trigger, such as an infection, skin injury, stress, cold weather, drinking alcohol, smoking and some medications.