What is the cause behind Mucormycosis?

As per the recent statement of All India Institute of Medical Sciences (AIIMS) Director, Dr. Randeep Guleria, the reason behind the cause of Mucormycosis are:

1. High dose of steroids for a long period of time, with Predisposing conditions like diabetes may lead to fungal infection.

2. Early use of steroids might lead to secondary infection, both bacteria and fungal.

3. Mucormycosis predominantly involves the sinuses, the eye and at times it can go on to the brain.