A Violaceous Retiform Rash With Progressive Lower Extremity Ischemia in a 66-Year-Old Man Margaret Mercante; Rishab Revankar, MD; Shira Lanyi, MD; Gabrielle Schwartzman, MD; Danielle Nelson, MD; Scott Berg, MD; Barrett Zlotoff, MD

https://reference.medscape.com/viewarticle/violaceous-retiform-rash-progressive-lower-extremity-2026a1000d6p?ecd=WNL_casechlg_260524_MSCPREF_etid8365124&uac=148436CN&impID=8365124 A 66-year-old man with a history of JAK2-positive essential thrombocytosis, polysubstance use disorder, and prior right lower extremity osteomyelitis status post-toe amputation presents with worsening right foot pain, ulceration, and a violaceous rash extending proximally up the lower extremity. What's the diagnosis?