Probably one of the longest known illnesses of humans is Psoriasis. Psoriasis became the ugliest disease for every human that they experience. Either you are king, members of the royal family, a politician, a businessman or such an ordinary individual you are not safe in psoriasis. Scholars believe that the tzaraat disease mention in the Bible is likely the same with psoriasis. It was first introduced by Hippocrates (Greek Physician between 460 and 377 BC) but no formal introduction that time until in the first century that Cornelius Celsus (Roman author) described it as a condition that caused by staphylococcus pyogenes of red patches with watery blisters on the skin.
During the time of Hippocrates, a psoriasis disease had different names such as lepra, psora, alphos and leichen. And Psoriasis became part of the medicinal literature after Joseph Jacob Plenck of Vienna in 1776 as scaly or scale like diseases. Plenck doesn’t compared the Psoriasis from other skin diseases discovered until Robert Willan (1757-1812), an English dermatologist together with Thomas Bateman recognized this disease as an independent. They divided it into two categories: (1) Leprosa Graecorum, as the condition when the skin had scales; and (2) Psora Leprosa, as the condition when it became eruptive.