What is Psoriasis?
Psoriasis is a chronic skin disease with long-term evolution, characterized by the appearance of red patches (erythematic), prominent, well defined, covered by thick scales ("crust"), pearly white, easily removable.
Psoriasis affects generally the extension areas of the body (elbows, knees, loins, the insertion of hair on the scalp), or nails, but psoriasis can affect any other areas of the body.
Also, psoriasis may accompany the damage to the joints – arthritis psoriasis or psoriatic arthropathy.
Psoriasis is a chronic dermatological disease that causes the over-rapid growth of skin cells, resulting in the appearance of whitish thickened skin plaques (hyperkeratosis).
These lesions can vary in size and are mainly located in the knees, elbows, scalp, hands, legs and sacral region (lower back). Psoriasis is more common among adults, but can occur among children and adolescents too.
Normally, skin cells grow and mature gradually, during a period of 28 days (cellular turn-over), being replaced by other young cells. Aged cells in the superficial layers of skin are gradually replaced with new cells from deeper layers.
Superficial layers cells gradually die and loose with daily activities (bathing, wearing clothes).
In psoriasis, cells do not mature enough, but they quickly migrate to the superficial layers of skin (in 3-6 days) forming here lesions characteristic to the disease (hyperkeratotic plates).