Musely FaceRx offers multiple formulas of The Spot Cream. If the prescription written for you by your assigned dermatologist says that your fills contain Kojic Acid, then the pharmacy included it in your fill.
As Kojic Acid is an excipient (a substance formulated alongside active ingredients), it will not be listed as an active ingredient on the bottle.
You can confirm this by checking the prescription label on your bottle; as long as it does not say "NoKA", then you can be sure it is in your fill.