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idiopathic livedo reticularis  livedo reticularis with an unknown cause, usually seen in young adults, especially women; it is chronic, characterized by symmetrical diffuse lesions, and more common in winter. Some patients develop ulcerations on the legs or feet, either initially or after edema.

livedo racemosa  livedo reticularis.
  some authorities limit this term to types of livedo reticularis that persist in spite of warming or other environmental changes.

livedo reticularis  reddish blue, netlike mottling of the skin; it is exacerbated by exposure to cold. It may occur normally, as in cutis marmorata. The two principal types are idiopathic livedo reticularis and secondary livedo reticularis.

secondary livedo reticularis  livedo reticularis associated with some other disorder, usually with a condition involving a change in blood viscosity changes, embolization, or vessel wall disease; the distribution on the skin is usually asymmetrical and patchy. The associated conditions include vascular diseases such as arteriosclerosis, vascular calcification with hyperparathyroidism, and arteritis; occlusive conditions of the blood vessels such as thrombocytopenia, cryoglobulinemia, emboli, and decompression sickness; and various other conditions.

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