A call centre worker says fillers made her lips so swollen that the right side of her mouth became paralysed.
Alex Oakley, from Kent, said she 'felt like a stroke victim' after her top right lip ballooned to triple its size after the £150 treatment.
She claimed her "slug" lip oozed pus following the 'painful' procedure.
The problem became so bad she was unable to talk to customers.
When the 27-year-old contacted the practitioner who injected her lips she was reportedly told to wait two weeks for it to settle down, to ice them regularly, sleep propped up and eat pineapple.
But days later call centre banking agent Alex went to A&E where doctors prescribed a week-long course of antibiotics.
She also contacted a private doctor in a desperate bid to tackle her ballooning lip - eventually forking out £2,000 to get it treated.
Now she is sharing her ordeal to warn others of the potential risks of having cosmetic treatments.
Alex, from Maidstone said: "When I went to work I knew something was wrong because I was talking and I could just feel my lips weren't moving.
"I started panicking because I could tell people were looking at it but weren't saying anything.
"My lip was triple the size it normally is. It was only one side and I kept messaging the girl [practitioner] 'I feel like I've had a stroke' as I couldn't move the right side of my mouth.
"It was the worst pain, it was horrible.
"I felt so sorry for the doctor and receptionist as I was screaming. My teeth were throbbing as well as I had no blood circulation, it was a nightmare.
"The doctor said she was concerned that in the pictures I sent her you could see my lip had turned white, meaning I had no blood flow.
"She needed to lift my lip up but my lip was so swollen she couldn't move it and I was in agony. It looked like a slug on my face.
"She said she needed to numb me as she needed to see what was going on. She put the needle in my lip and as soon as she did that my lip just burst.
"It exploded and pus went all over my doctor. It wasn't the best experience I've ever had.
"I couldn't let her touch me because I was in so much pain.
"She gave me some really strong antibiotics and painkillers and took a sample from my lip and sent it off for testing."
Alex, who lives with 27-year-old carpenter Will Scott, had lip filler twice previously with a medically-trained nurse back in 2018 with no problems.
But after spotting an offer of 1ml of filler for £150 with a different practitioner who was recommended by pals, she decided to give it a go.
Alex said: "I decided to get fillers because I'm insecure about how I look. I'd seen people I knew who had had it done and I liked what I saw.
"I felt like I had quite thin lips so it was just a little confidence boost. The first time I had my lips done was by a nurse and I paid £200 for 0.5ml.
"I was happy with the results at first but then I wanted to keep doing it.
"My lips never looked huge, they just plumped up a little bit. I got another lot done with her but then I wanted them slightly bigger."
After hearing about a beauty therapist from friends who was offering 1ml of filler for £150, Alex took the plunge and booked with her, undergoing the treatment on April 5, 2019.
Over the following two days Alex's top-right lip started to swell and became increasingly painful.
Panicked Alex sent pictures of her face to the practitioner for advice and reassurance and was told her lips looked 'healthy' and to keep taking pain relief.
Alex said: "My friends had used her, I'd heard good things about her, she had thousands of followers and it was £50 cheaper for more filler.
"After having the filler my lips were hurting but it was sort of expected.
"It was a throbbing pain to begin with, but I'd only just had them done so I didn't think anything of it. Over the next three days the pain was getting worse.
"I sent her a picture and she said it was just swollen, and that it looked healthy and was nothing to worry about.
"She said it would be fine in two weeks' time, to just keep taking the pain relief, told me to eat pineapple and to sleep with an extra pillow under my head."
Tearful Alex was taken to Maidstone Hospital's A&E department on April 8 by Will's mum.
Opting for a second opinion, Alex also submitted her details and photos online to a private clinic, which contacted her urging to get her lips checked out by their doctor.
At A&E baffled doctors examined her lips and gave her a course of antibiotics then Alex headed to the private clinic to get it further looked into.
Alex said: "I was crying because I was in so much pain and Will's mum told me I needed to get it seen, I was pretty much straight in and out.
"The doctor told me it was an infection so gave me a seven-day course of antibiotics.
"The private clinic rang me and said the doctor was in London for meetings but she was going to come home to see me.
"They told me not to panic but said I needed to be seen.
"The doctor was concerned that in the pictures I had no blood flow to my lip and that I had an abscess.
"It exploded and both filler and pus came out.
"She gave me some really strong antibiotics and painkillers and also took a sample from my lip and sent it off for testing.
"The sample came back [indicating] that there was bacteria - meaning dirt had got into the wound.
"It's really hard to pinpoint where it had come from but she said it's more likely the mouth wasn't cleaned properly before I had it done."
Alex said: "I personally think you pay for quality. It's really tricky, it's appealing when it's cheap and they've got thousands of followers.
"The girl I originally went to only had a couple of hundred but she was a nurse during the day.
"It's crazy you can go on a course for two days and then you're qualified, it's not right.
"She didn't know I had a problem but a doctor saw that picture and knew it was a problem. They should be medically trained.
"Everything's back to normal now but I'm never doing it again."