skin disorder Livedo reticularis NCIt:C74524 MESH:D054068 Sirarat Sarntivijai MedDRA:10024648 SNOMEDCT:238772004 A condition characterized by a reticular or fishnet pattern on the skin of lower extremities and other parts of the body. This red and blue pattern is due to deoxygenated blood in unstable dermal blood vessels. The condition is intensified by cold exposure and relieved by rewarming.