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Psoriasis is a skin condition that causes scaling, according to Mayo Clinic. This condition is a chronic condition that alters the skin cells' life cycle. This causes the skin cells to accumulate on the skin, which causes a thickening of the skin.
An area affected by psoriasis is sometimes painful because of the red, dry patches that form. If the rash itches, cortisone cream is sometimes used to treat the itch.
Psoriasis can also affect the nails and joints. Nails can become pitted, thick and ridged. Joints can become stiff and swollen.
A person with psoriasis usually needs medical care and monitoring to help treat and control the condition.