A woman was left looking like "Frankenstein" after being injected with what she thought was Botox.
Botox (Botulinum toxin) injections relax the muscles in your face to smooth out lines and wrinkles, such as crow's feet and frown lines.
It's not permanent – it usually lasts for around three or four months.
The person doing Botox injections should be suitably qualified and experienced.
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They should be a medical practitioner and on a register to show they meet set standards in training, skill and insurance.
But Fake Britain discovered there are people creating fake Botox, with disastrous consequences.
Marcelle King, 63, saw an advert on Facebook that offered simple Botox treatments in West London.
She booked an appointment, but after driving to the address, she arrived at a private home, not a clinic.
Marcelle said: "This guy turned up and I saw he'd driven up in a brand new BMW and that gave me no cause for concern…
"The only question I asked him was if he was going to use those fine needles like I've seen on TV.
"And he held up what looked like a dog vaccination needle to me and said no these are better."
Ozan Melin proceeded to inject Marcelle, who paid him £300.
But after a couple of days, Marcelle noticed "no change whatsoever", so two weeks later she booked in again.
Marcelle said: "Round two was excruciatingly painful, he did say 'I don't dilute as recommended because it works quicker'.
"It was like being burnt with cigarette ends and at one point I put my hand up and said I can't take any more.
"I gave him another £100 and I actually couldn't wait to get out of there because I could feel my forehead really burning."
She continued: "By the time I got in the car my forehead was swelling like Frankenstein's monster and it was really red and really burning."
Marcelle claims Ozan Melin told her to take ibuprofen, but the problem was more profound than that.
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She said: "They rushed me into resus, I was in there for about six hours.
"My face felt like chemical burning, like it was just on fire."
Emergency medication was needed to halt the effects of whatever it was that was injected into Marcelle's face.
Marcelle said: "Apparently I came quite close to death."
It is not known exactly what Ozan Melin injected into people's faces. The police suspect it was a substance he'd imported from China.
It took three weeks for the swelling on Marcelle's face to calm down and left her with permanent damage to her facial muscles.
According to a BBC report, Melin was jailed for four years in June 2018 on two counts of GBH.
On April 2 2019, Melin's sentence was reduced to two years after Court of Appeal judges overturned one of his convictions.
*Tonight's episode of Fake Britain was a repeat.