What your derm said *can* be true, but it doesn't *have* to be. While it is true that some facialists are clueless and/or untrained when it comes to acne, this is not always the case.
I admit that I have had some bad facials that really involved nothing more than some minor extractions and a slathering of heavy cream. THIS will not help your skin. I did break out from those, and my skin looked no better.
However, I used to get regular bi-weekly facials from a properly trained European facialist. I would have European deep cleansing facials with PROPER extractions (not a lot of squeezing-a sterile needle was used to empty the pus for deep and/or infected pimples), and proper products. Small pimples were removed with tissues and fingertips, and not with rough tools. My skin looked amazing and clear, and my breakouts were reduced. My skin never broke out after a facial, nor was it red for more than 1 day, if that. Generally I walked out with clear and even toned skin.
Some people prefer to get facials such as this done at their derm's office (more money for the derm!). They are often called "medical facials". Some involve resurfacing techniques, but not all. Anything involving laser MUST be done by a qualified and specially trained RN or MD, in a Doctor's office.
Many places do not do true European facials, so you need to search for those who do, and who are properly trained and certified.
The bottom line is this, if you have acne/oil/sensitive/problem skin, a regular "relaxing" facial is not going to cut it. It will not help unclog your pores, and may even make your skin worse.
That said, a proper deep cleaning European facial SHOULD help.
I have moved from my home city (and facialist) and I am back in school, so $200/month on facials are sadly a thing of the past for me....
But they DID help.