Livedo reticularishttps://en.wikipedia.org/wiki/Livedo_reticularis
Livedo reticularis is a common skin finding characterized by a mottled, reticulated vascular pattern that appears as a lace‑like purplish discoloration. It may be worsened by cold exposure and most often involves the lower extremities. The discoloration results from reduced blood flow through arterioles that supply the cutaneous capillaries, causing deoxygenated blood to appear blue. Secondary causes include hyperlipidemia, microvascular hematologic or anemic conditions, nutritional deficiencies, hyper‑ and autoimmune diseases, and certain drugs or toxins.

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  • Lesion due to severe infrarenal aortoiliac stenosis.
  • Erythema ab igne vs. Livedo reticularis
References Livedo reticularis: A review of the literature 26500860 
NIH
Livedo reticularis (LR) is a cutaneous physical sign characterized by transient or persistent, blotchy, reddish-blue to purple, net-like cyanotic pattern. LR is a benign disorder affecting mainly middle-aged females, whereas livedo racemosa (LRC) is pathologic, commonly associated with antiphospholipid antibody syndrome.