What does Hawaii prohibit in med spa advertising?

Short answer
The cited rules do not settle this — they limit rather than license ads: a physician can be disciplined for false, fraudulent, or deceptive advertising, including excessive specialty-expertise claims or assuring a permanent cure for an incurable disease.

The advertising provisions that reach a Hawaii medical practice in the sections cited here are the licensing grounds and the unfair-practices statute. The medical practice act makes false, fraudulent, or deceptive advertising a ground for revoking, limiting, suspending, or denying a license, and names excessive claims of expertise in a specialty, assuring a permanent cure for an incurable disease, and any untruthful and improbable statement in advertising a practice; the uniform licensing statute lists the same ground, and the cosmetology act makes a false representation or promise through advertising a ground against a beauty operator or shop. A physician assistant may not advertise without the supervising physician’s name or in a manner implying independent practice. Outside the licensing system, unfair or deceptive acts or practices in trade or commerce are unlawful, construed in light of Federal Trade Commission law, with a civil fine of $500 to $10,000 per violation collected by the attorney general or the director of the office of consumer protection, who may also sue to enjoin a violation. None of these provisions mentions before-and-after photographs, testimonials, or discounts.