Livedo reticularishttps://en.wikipedia.org/wiki/Livedo_reticularis
Livedo reticularis est communis pellis inveniens vascularium maculosum reticulatum quae apparet sicut color vitta instar purpurei coloris. Exaggeratio frigoris aggravatur, et frequentius in inferioribus partibus fit. Color causatur per reductionem sanguinis per arteriolas quae capillarium cutaneos praebent, inde in sanguine deoxygenato coloris caerulei coloris exhibens. Hoc secundario causari potest per hyperlipidemia (hyperlipidemia), microvasculares hematologicas vel anemias, defectus nutritionales, hyper- et morbos autoimmunes, et medicamenta/toxina.

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References Livedo reticularis: A review of the literature 26500860 
NIH
Livedo reticularis (LR) conditio cutis ad tempus vel diuturnum, maculosum, rubicundum, purpureum, instar reticulati, notatum est. Ea maxime afficit media inferiora feminas et plerumque asymptomaticas. Aliunde, livedo racemosa (LRC) forma gravis est saepe cum syndrome antiphospholipidum (antiphospholipid antibody syndrome) coniuncta.
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.