Psoriasis is probably one of the diseases that have long been found in humans and is a disease that also raises many question marks in the diagnosis. Some researchers believe that psoriasis had existed long ago and known as "Tzaraat" in the Bible. At the time of dahalu psoriasis included in category one variation of leprosy.
In the 18th century, British dermatologist, Robert Willan and Thomas Bateman distinguish psoriasis with other skin diseases. It is said that the abnormalities in the skin of leprosy efloresensi a regular, circular macula is always temporary in psoriasis in an irregular entuk. With all the confusion that exists, then in 1841, the condition of the skin disorder called psoriasis by experts from Vienis dermatolgis, German named Ferdinand von Hebra. It took its name from the Greek word "psora" meaning "itch".
Psoriasis is an autoimmune disease that causes, are chronic and residif, characterized by patches of erythema skuama demarcated with a rugged, multi-layered and transparent, with the phenomenon of wax droplets, Auspitz, and Kobner.
Psoriasis is a chronic inflammatory disease hiperproliferatif and on the skin with clinical manifestations similar to each ethnicity. The disease is associated with skin diseases hiperproliferatif mild to severe degree and joint inflammation. Disease onset and degree of illness is influenced by age and genetics, and is triggered by various internal and external factors, such as physical injury to the skin, systemic treatment, infection, and emotional stress. More frequently encountered cases of psoriasis. Although the disease is not fatal but causes cosmetic disturbance, the more so given that chronic and residif journey. The incidence of psoriasis spread throughout the world, but its prevalence varies in ethnic and geographical dareah. Psoriasis therapies have minimal variation in each ethnicity.
Cases of psoriasis more frequently found. Although the disease is not fatal but causes cosmetic problems mainly due to the disease course is chronic and residif. Incidence in whites is higher than the colored population. In Europe, reported to be between 3-7%, 1-2% in the United States while in Japan 0.6%. On black people, for example in Africa as well as the rarely reported in the American Indian tribes. Psoriasis can be affected in men and women. Slightly higher incidence of men than women. Psoriasis is found in all age groups but generally in adults between the ages of 15-25 years.
Age of psoriasis onset in early type with the peak age of 22.5 years (in children, the average onset age of 8 years). For the slow type, appeared at the age of 55 years. Early onset of disease and predict the degree of chronic diseases, and is usually accompanied by a family history of psoriasis. No difference in incidence between men and women. Psoriasis affects 1.5 - 2% of the population of western countries. In the United States, there are 3 to 5 million people suffer from psoriasis. Most of them suffer from psoriasis locally, but around 300,000 people suffer from generalized psoriasis.