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Dermatologist Sandra Lee of California is better known as Dr. Pimple Popper, but it didn’t take her long for her to discover she wasn’t dealing with some mere black head.Dr. Lee, who often shares her work on YouTube, believed the large bump on this man’s foot was a ganglion cyst, a fluid-filled swelling that usually develops near a joint or tendon.

RELATED: When the goo flies out of this cyst, even the doctor screams

“I wasn’t sure what it was before removing it,” she said. “And now I know why I couldn’t figure out exactly what it was before removing it. Pathology confirmed this was a Palisaded Encapsulated Neuroma, which is not very common.

“This is a benign growth, a collection of nerve cells in a bundle. It is not malignant or life-threatening.”

But is hard to watch. You’ve been warned.