As Kim Phuc fled the aftermath of a napalm attack – her face agape in terror and pain – the nine-year-old unwittingly became a living symbol of the horrors of the Vietnam War.

Some forty years later, the 52-year-old is receiving medical treatment for the wounds she suffered after the South Vietnamese military accidentally dropped napalm on civilians in Trang Bang village near Saigon.

Mrs Phuc travelled from her home in Canada, where she moved with her husband in the early 1990s, to Miami to visit a dermatologist who specialises in laser treatments for burn patients.

Dr Jill Waibel of the Miami Dermatology and Laser Institute, hopes the treatment will relieve the aches and pains caused by the explosion, and soften the scarred skin which spreads from Ms Phuc’s left hand to her arm, up her neck to her hairline and down almost all of her back.

“So many years I thought that I have no more scars, no more pain when I'm in heaven. But now — heaven on earth for me!” Mrs Phuc told Associated Press reporters.

Accompanying her was her husband Bui Huy Toan and Nick Ut: the Associated Press photojournalist who captured the moment on 8 June, 1972, that changed Ms Phuc’s life, and won him the Pulitzer Prize.

Mr Ut said he remembered the young girl screaming that she was “too hot” as he gave her shelter in the AP van.

“I think I'm dying, too hot, too hot, I'm dying,” she cried as her skin peeled off her body. She was left with scars almost four times as thick as normal skin.

She went on to tell CNN in June: "I always remember that horrible day that we ran from life to death."

At the time, she was embarrassed by the photo, and she found it difficult to cope with the publicity, she told CNN.

Napalm victim in iconic photo receives medical treatment - in pictures Show all 5 1 /5 Napalm victim in iconic photo receives medical treatment - in pictures Napalm victim in iconic photo receives medical treatment - in pictures Napalm victim in iconic photo receives medical treatment - in pictures Napalm victim in iconic photo receives medical treatment - in pictures Dr. Jill Waibel examines Kim Phuc before the first of several laser treatments to reduce pain and the appearance of burn scars in her back and left arm in Miami. Phuc was injured by a napalm bomb in Vietnam 40 years ago. AP Photo/Nick Ut Napalm victim in iconic photo receives medical treatment - in pictures In this Sept. 26, 2015, photo, Dr. Jill Waibel, left, applies a laser to the back of Kim Phuc to reduce the pain and appearance of her burn scars in Miami. Phuc was burned in the back and left arm by a napalm bomb in Vietnam 40 years ago. The procedure creates microscopic holes in the skin, which allows topical, collagen-building medicines to be absorbed deep through the layers of tissue. AP Photo/Nick Ut Napalm victim in iconic photo receives medical treatment - in pictures In this Sept. 25, 2015 photo, Kim Phuc shows burn scars on her back and left arm at a hotel in Miami. The scars were caused by a napalm attack when she was 9 years old in Trang Bang, Vietnam. While she spent years doing painful exercises to preserve her range of motion, her left arm still doesn't extend as far as her right arm, and her desire to learn how to play the piano has been thwarted by stiffness in her left hand. Tasks as simple as carrying her purse on her left side are too difficult. AP Photo/Nick Ut

But her opinion gradually changed: “I realized that if I couldn't escape that picture, I wanted to go back to work with that picture for peace. And that is my choice.”

Now, she refers to Mr Ut as “Uncle Ut.”

“He's the beginning and the end,” Mrs Phuc said.

“He took my picture and now he'll be here with me with this new journey, new chapter.”

At the time, Ms Phuc was lucky to be alive after suffering serious burn across over a third of her body, said Waibel.

“I think I'm dying, too hot, too hot, I'm dying,” <p>Kim Phuc moments after the napalm bomb in 1972</p>

"As a child, I loved to climb on the tree, like a monkey," picking the best guavas, tossing them down to her friends, Phuc says. “After I got burned, I never climbed on the tree anymore and I never played the game like before with my friends. It's really difficult. I was really, really disabled."

Vietnam celebrates 40 years since the fall of Saigon

Dr Waibel predicts that Mrs Phuc will need around seven treatments over up to nine months.

Speaking at home in Canada, Ms Phuc said the aftermath of treatment is uncomfortable, but she will go on undeterred.

“Maybe it takes a year,” she says. “But I am really excited — and thankful.”