Lisa, 43, said the grim growth, which resembled a pork scratching, had been protruding from her scalp for more than a year.
Desperate to be rid of it, she went to see Dr Pimple Popper, fearing the growth could be cancerous.
"It grows every day," she tells the camera. "It's painful at times. It has a ring that it grows out of that is very tender.
"It's a horn, basically. Like a rhinoceros, it's a hard horn.
"I don't want anybody to see it, so I wear my hair up and pretty much tuck it under my hair."
While the horn is painful, it's the emotional impact it's had that affected Lisa the most.
"It makes me feel gross," she admitted. "Who has a horn growing out of their head?"
She was so embarrassed by the horn, she put her wedding plans on hold, having got engaged five years ago.
It grows every day. It’s painful at times. It has a ring that it grows out of that is very tender.
"My finance has been asking, 'when are we going to set a date?' and I put it off, because I want to look pretty on my wedding day.
"Usually when you get married you're standing with your back to them.
"It (the horn) is the first thing I think they're going to see."
What is a cutaneous horn?
A CUTANEOUS horn is a growth protruding from the skin.
They tend to resemble an animal horn, hence their name.
While most are benign, a small number can be cancerous or precancerous.
They develop from the skin's keratin, often in people with sun-damaged skin.
Some experts believe sun exposure is a cause of the unsightly lumps.
People at greatest risk of developing a horn include:
- people with fair skin
- those with human papillomavirus (HPV)
- older adults
- people with lots of sun damage on their skin
If you notice a growth, of any kind, on your skin go and see your GP straight away.
After turning up at Dr Pimple Popper, aka Dr Sandra Lee's clinic Lisa is relieved to hear she would try to remove the lump.
Breaking down in tears Lisa confessed that she feared the horn is cancer.
But after examining the growth, Dr Lee told Lisa she was going to try and remove it.
Dr Pimple Popper said: "I've seen cutaneous horns before, but certainly this is the largest cutaneous horn that I have ever seen."
After numbing the top of Lisa's head, Dr Lee wrestled with the horn before pulling it free.
She said: "I'm going to pull on this and see, yeah one big, swift knock from your dog and I think you would have had this thing on the floor.
"I am happy to tell you it looks like we've pulled together your skin nicely."
And to prove how hard it is, Dr Lee's banged it on a metal dish.
The moment proved too much for Lisa, who burst into tears.
"To see the horn I've had on the back of my head for more than a year, is unreal. It's finally gone," she said.
"I don't know why I waited so long, I don't know why I didn't just do it before.
"I've missed out on doing so many things the past year for something that took 30 minutes."
Dr Pimple Popper airs tonight at 9pm exclusively on TLC
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