When a nursing mother saw her armpits were leaking milk, she assumed she had a 'third nipple,' only to discover there was a perfectly good reason for it. Watch her recount the terrifying incident below:

Lindsay White (@thelittlemilkbar) recently posted a TikTok video explaining how to 'leak breast milk in areas other than your boobs,' telling viewers, "This is going to blow your mind."

"One day I was stroking Allie and saw her hair was wet," she recalled. It was then that I realized it was coming from my armpit.

"At first, I assumed I was just overheating, but then I noticed this massive lump."

"White claimed she squeezed it' and, to her surprise,' milk squirted out,' so she went to see her doctor."

"I went to the doctor, thinking I might have a third nipple, but she said 'Nope!'" "Your milk line extends up through your armpits."

White's video has already received over five million views, with White explaining in a follow-up post that while she only ever leaked from one location with Allie, when she became pregnant with her son Koda, she leaked milk from 'both sides.'

"Instead of just one large lump, I had these two small things spring up that had never been there before – and on the other side as well," she explained.

"So I leaked milk from three locations on one side and two on the other... "I'm unquestionably a milk maker!"

According to Emily Brittingham, International Board Certified Lactation Consultant (IBCLC), breast tissue that spreads to the armpit is typical.

Brittingham stated for BellyBelly.com: "At six weeks gestation, when you were a small embryo in your mother's womb, milk lines began to emerge, beginning from your underarms."

"These lines ran down both sides of your torso, all the way to your groyne."

"From 16 weeks gestation, the 'tails' at both ends of these lines began to regress," she explained.

"However, in some fetuses, the line does not regress at either end, leaving the 'tail.' Axillary tissue, often known as 'the tail of Spence,' is the tissue that extends into the armpit.

Brittingham claims that the level of hormones that aid in the production of milk is 10 to 20 times higher during pregnancy, and that these hormones cause the milk ducts to grow.

"Within the breasts, the ducts begin to branch out. "They can access any 'tails' of breast tissue along the milk line," she explained.

"If you have extra breast tissue in your armpit, it's conceivable that you have milk ducts as well."