The blood vessels of psoriasis.

The true microcirculation is the flow of fluid and its contents through the tissues. This is controlled by blood vessels and lymphatics. Both are abnormal in psoriasis and may significantly contribute to its pathogenesis. The type of vasculature characteristic of psoriasis is common to many pathological states and probably influences the metabolism of the tissues in such a way as to maintain the pathology in status quo. It imparts to the tissue a special vulnerability but also encourages repair.