The girl had been complaining of headaches and was rushed to hospital by her mum – who thought she simply had an allergy – when her eyes dramatically puffed up.
Scarlett Chavez was given the set of illuminating devil horns before Halloween.
But she started to complain to her mother, Tony Rose, that her nose was hurting and she was suffering pain between her eyes.
Then, on November 1, both of the little girl's eyes turned red, and they began swelling before she went to bed at the family home in Cavite, south of Manila, on Luzon Island in the Philippines.
Her concerned mum gave her painkillers and antihistamines, after incorrectly believing she had suffered an allergic reaction to something they had eaten.
However she rushed her daughter to hospital the next morning when the swelling to her eyes became worse and a thick liquid started pouring from her nostrils.
Medics performed an X-ray and were shocked when they saw the small circular metal battery.
It had come from a pair of plastic light-up red devil horns she had been given a week before for trick-or-treating.
Tony explained: ''Scarlett couldn't sleep and she was crying. The next morning I cleaned her nose, and there was a dark liquid coming out that didn't seem like blood. But it smelled very earthy.
''She kept telling me that it's painful and she said that while she was playing, a rock went inside her nose.
''That's why I took her to hospital, because I thought that if a foreign object was inside her nose, they could do something to help.''
When doctors removed the battery, the mum immediately recognised it as being from the red headband that she had bought for the youngster.
The mother believes that the battery had been lodged in her daughter's nose for around four days before the pain because unbearable for her.
Tony added: ''This is the sort of thing I never would have thought would happen. But children are so curious, they get into all sorts of situations.
''I think all parents should be careful when they give their children any toys or items that have small parts or batteries inside.
"This accident could have been much worse."
The EcoWaste Coalition, an environmental group campaigning to prevent children from harmful chemicals said that if accidentally ingested, button batteries can get stuck or lodged in the throat and cause chemical burns in just two hours.
If accidentally pushed into nostrils, they may cause mucous membrane injury, a fissure, or hole in the bone and cartilage of the nose, scar tissue and cellulitis of the eyelid.
Thony Dizon, a campaigner, said: "Button batteries can pose serious health hazards, including chemical burns and should therefore be treated like poison and kept out of children’s view and reach.
"Like what the girl’s mother did, parents should promptly bring a child who has swallowed a button battery or placed on in the nostril or ear to a doctor so the battery is quickly removed to avoid serious or permanent damage."
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