NCIt definition : A recurrent purple discoloration of the skin that does not blanche and is found in
a lacy, network pattern, most often in the lower extremities. It may be aggravated
by exposure to cold and is classified as idiopathic or secondary. Secondary livedo
reticularis may be a cutaneous manifestation of immune system disorders (e.g., lupus
erythematosus, rheumatoid arthritis, cryoglobulinemia, lymphoma, etc), and hematologic
disorders (polycythemia vera).;