NEW DELHI — Doctors in India are concerned about an increasing number of potentially fatal fungal infections affecting either people who have Covid-19 or those who have recently recovered from the disease.

The condition, known as mucormycosis, has a high mortality rate and was present in India before the pandemic. It is caused by a mold that thrives in wet environments and can attack through the respiratory tract, potentially eroding facial structures and harming the brain.

The condition is relatively rare, but doctors and medical experts say it seems to be infecting some Covid patients whose weakened immune systems and underlying conditions, particularly diabetes, leave them vulnerable.

Some experts attribute the fungal infections to an increased use of steroids to treat hospitalized patients. Another factor could be that, with hospitals overwhelmed in this second wave of the pandemic, many families are self-medicating and applying oxygen therapy at home without the proper hygiene, experts say.

In the western state of Maharashtra, which includes the commercial hub of Mumbai and has been badly devastated by the pandemic, local news media reported that around 200 patients who had recovered from Covid were being treated for mucormycosis and that eight had died.

In Gujarat, a western state north of Maharashtra, the state government ordered the allocation of separate wards in hospitals for the treatment of the infection, and said it had put purchase orders for 5,000 doses of amphotericin b, a medicine used to treat it. Infections have also been reported in hospitals in the country’s capital, New Delhi.