I read this on youtube:
For starters, I don't think this is acne at all. Based on what I'm seeing, the doctor is using a small laser to make tiny lacerations for malformed sebaceous glands. Most people have proper sebaceous glands that allow for pimples to form in the first place, meaning, that a slight infection has an opening for the pus to go. This person seems to lack the openings, or properly formed sebaceous glands, thus they cannot drain naturally. It may leave some scars, but its better than infection.