An autoimmune disorder that can cause a net-like or starburst pattern of purpura and necrosis due to thrombosis.
The bite classically causes a lesion with a central violaceous area surrounded by a pale ring of ischemia and an outer red ring, which can have a retiform pattern.
A condition of vascular calcification and thrombosis, leading to intensely painful, violaceous, retiform purpura that progresses to necrotic ulcers with black eschars.
Showering of cholesterol crystals from an atherosclerotic plaque can cause a livedo reticularis pattern and painful, purpuric 'blue toe syndrome'.
A vasculitis that can occlude larger vessels, leading to retiform purpura and necrosis, in addition to typical palpable purpura.
A cutaneous sign of Pseudomonas sepsis, which can present as multiple hemorrhagic pustules that evolve into necrotic ulcers with a retiform border.
A rare reaction to heparin causing well-demarcated, painful, hemorrhagic plaques with a retiform border that progress to necrosis.
A rare lymphoma where malignant cells proliferate within blood vessels, causing occlusion and presenting as tender, indurated, purpuric plaques with a retiform pattern.
Can cause tender nodules that ulcerate, sometimes with a surrounding retiform purpuric pattern.
A medium-vessel vasculitis that characteristically causes tender subcutaneous nodules and a 'starburst' or broken-net pattern of livedo (livedo racemosa).
Vaso-occlusion from sickled red blood cells can cause painful leg ulcers with a surrounding retiform purpuric pattern.
While typically causing palpable purpura, vessel occlusion in certain vasculitides (like ANCA-associated vasculitis) can lead to larger, net-like patterns of purpura and necrosis.
A general term for purpura caused by occlusion of veins, leading to a net-like pattern, as seen in various hypercoagulable states.
A rare complication of warfarin therapy, presenting as painful, hemorrhagic skin lesions with a retiform border that progress to necrosis.
