This US nurse says "this is what you look like after wearing an N95 mask all day."

This nurse shows off the sores and marks on his face from as a result of wearing protective gear for long shifts.

An unidentified nurse in Iran fighting COVID-19 on the front lines with minimal equipment.

Jasmine Lyons, a New York City ER nurse, says the coronavirus pandemic is "serious and has changed our world in a matter of days."

Sally Helmi shares, "#Newark has 3,640 beds - 72% are occupied leaving 1,030 beds. As of 3/25 New Jersey has 3,675 cases of COVID19. It's these nurses on the front lines that will help triage the sick and dying. We have to keep them protected and stocked with ventilators or the need will outweigh the supply."

Nicole Urban, an RN at NYU Langone posted: "I have never been so exhausted, so sad, and so terrified. We are completely unprepared for what's to come."

Dana Levenson, a Canadian TV personality, said "As most of the world is isolating, shutting down, and running as far a away from the virus this guy, will be running into it. This guy is my guy and he is an emergency room doctor."

Dr. Cornelia Griggs, a surgeon in NYC wrote, "NYC. Mother of two, double frontline MD couple. Don't make us orphan our two toddlers. Running out of masks, eye protection and gloves at work."

Brazilian nurse Amanda Ramalho working to fight against the spread of coronavirus says the face mask "hurts and doesn't give much air."

RN Becca Pack shared on Twitter, "#FirstTweet hello Twitter, angry/sad/ exhausted nurse coming to you from the Frontlines. These are unprecedented times and this virus has revealed how poorly prepared we are."

An unidentified nurse shared, "I have never been this exhausted all my 15 years of nursing career... stay at home for us frontliners... I'm so scared to go to work everyday but it is our duty to serve."

Mary, a nurse at Ocean Medical Center in Brick, NJ, has been told to reuse her mask because of a shortage.

These are some of the hero nurses battling coronavirus on the front lines in New York City — and around the world.

The stark images are part of an Instagram and Facebook series called Diaries From The Field series, showing health care pros clad in goggles, face masks and head-to-toe protective gear as they fight against COVID-19, which has infected more than 435,000 people worldwide.

“The COVID pandemic is serious and has changed our world in a matter of days,” says a Big Apple nurse identified by her Instagram handle, @jaslyons. “After caring for those infected with COVID and being directly affected by the medical resource shortage – I can tell you this is no joke.”

Many featured in the series look exhausted, and some have sores on their faces from wearing masks for long hours.

One nurse from Cleveland, Ohio is pictured showing off her facial battle wounds after finishing up a 12-hour shift testing symptomatic patients at a drive-thru testing site.

Brazilian nurse Amanda Ramalho is also seen in the photo collection with markings under her eyes from the face masks she wears.

“The mask hurts and doesn’t give much air,” Ramalho was quoted as saying.

A US nurse pictured with red markings on her face said: “This is what you look like after wearing an N95 mask all day. We don’t have enough of anything,” according to the post.

The pictured nurses in the series — who are mostly unidentified — come from all around the globe, including Germany, India, Norway, France, Brazil, England, Italy, Iran and the US.

The organizers of the series are encouraging more nurses and caregivers to share their stories,

“We want your videos, short stories, pics and accounts of what you are going through as a provider during these challenging times,” the organizers say. “Your stories will make a difference and spread the word about the amazing work you are doing.”