Everyone offers it. Few differentiate.
Brand-name volume is high. Citation specificity is low.
Multiple clinics in any metro offer HydraFacial, so AI surfaces shortlist by specificity: which booster serums, which tier (Signature, Deluxe, Platinum), which signature pairings.
The audit checks whether your page gives surfaces something to cite beyond the brand name, and tracks the rising HydraFacial-vs-DiamondGlow comparison queries.