Sandra Siew Pin Lee Rebish (born December 20, 1970), also known as Dr. Pimple Popper, is an American board-certified dermatologist based in Upland, CA. She is known for her YouTube videos and TLC's reality series Dr. Pimple Popper.

Her parents migrated to New York in 1969, and the family relocated to Southern California when Lee was five years old. Lee attended UCLA as an undergraduate student. During this time, she worked part-time as a medical assistant for an allergist in Downtown Los Angeles. After graduating from UCLA, she attended medical school at the Drexel University College of Medicine and graduated in 1998. She completed her internship at Allegheny General Hospital in Pittsburgh. Lee completed her dermatology residency at Southern Illinois University. After her residency finished, she went to San Diego to further her experience with laser, dermatological and cosmetic surgery.

Lee is a board-certified dermatologist and a member of the American Academy of Dermatology, the American Academy of Cosmetic Surgery, the American Society for Dermatologic Surgery, and the American Society for Mohs Surgery.

In 2010, Lee began uploading videos to YouTube but did not begin to heavily post content until 2015, after she noticed the popularity of her Instagram videos of skin extractions. Lee has over 7.3 million people (as of December 2021) subscribed to her YouTube channel, with total viewers being one billion and counting.[5] On August 14, 2018, she made a guest appearance on Jimmy Kimmel Live!

In 2017, Lee launched her own line of skin care products, SLMD Skincare Products. In 2018, Lee signed with TLC to have her own Dr. Pimple Popper TV series, which premiered on July 11.

Lee now lives in Upland, CA, with her husband, fellow dermatologist Jeffrey C. Rebish (married May 28, 2000), and currently works at Skin Physicians & Surgeons.