In Dr. Pimple Popper's new Instagram video, she helps a woman with a mystery bump on her eyelid. Fans asked if it was a "chalazion" but the dermatologist calls it a whitehead.

A pimple on your eyelid usually isn't acne — it's probably a stye, chalazion, or xanthelasma. A stye is a round, red bump that can be treated with a warm compress to drain the pus.