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. You can confirm this by checking the prescription label on your bottle. If the bottle says "NoKA" (meaning No Kojic Acid), then it is not contained in your fill, otherwise you can be sure that it is included.
As Kojic Acid is an excipient (a substance formulated alongside active ingredients), it will not be listed as an active ingredient on the bottle.