Covid-19 is an infectious disease caused due to most recently discovered corona virus (SARS-CoV-2). Several studies have been published discussing the course of the disease, various treatment options available and possible complications that might arise due to the infection. One such major complication seen in COVID-19 patients is Mucormycosis or Black Fungus infection. Here we will discuss everything you need to know about Mucormycosis and why this infection alongside with Covid-19 can be lethal.