Psoriasis is a chronic skin disease that causes scaly lesions that show up as swollen red patches in different areas of the body.
It is mainly located on the elbows, knees and scalp, but it can appear anywhere on the body. The severity can vary considerably.
Psoriasis can occur at any age, but many patients develop it when they are between 20 and 30 years old. There is a high incidence of the disease during the late adolescence and the early twenties, and a second peak at fifty.
The duration may vary, but in most patients, the chain of remissions and exacerbations may last many years, even a lifetime.
If psoriasis is treated properly, many people affected can enjoy a good quality of life.