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What grows under the skin can be eye-popping, not to mention disgusting. Why people have a fascination about it, though, is even more mind-boggling.

And, make no mistake, they want to see it.

Millions of YouTube viewers have tuned in to Dr. Pimple Popper, aka, Sandra Lee, a Southern California dermatologist who shares skin removal procedures over the information super highway.

“Mr. Wilson’s Blackhead Extractions, Session 6, Part 2 of 2” has attracted almost 350,000 viewers since being posted on Dec. 26.

RELATED: Dr. Pimple Popper removes a zit so big it leaves a hole.

She has as many YouTube subscribers, and her videos have been viewed more than 140 million times … and counting.

What’s the appeal?

For Dr. Lee, it’s education and, yes, entertainment.

“With her entertaining and educational videos, Dr. Lee aims to give people a better understanding of how to take care of their skin and to create awareness of various skin conditions and diseases,” her website reads. “So, regardless if you want expert advice or just want to watch countless hours of blackhead, whitehead and cyst extractions, Dr. Lee has you covered.”