壊疽の原因は幅広い。患部で嫌気性細菌（あるいは好気性菌）が急速に増殖する事により起こる。大元の原因は動脈硬化症、糖尿病、腎不全（透析患者）、膠原病、血管炎、感染症などさまざまである。 COVID-19 troubles: Many people who had COVID-19 and seasoned blood clotting troubles later designed dry gangrene inside their fingers and toes. Far more exploration is necessary to understand this link th... https://www.sgvascularctr.com/what-is-a-gangrene/