8397fa35_ening_ingredients___WHITERskin__2
[0] Topical corticosteroids [1] Several forms of corticosteroids include Hydrocortisone, Clobetasol Propionate, Fluocinolone Acetonide or Betamethasone Dipropionate [3] Fast temporary skin lightening, however prolonged use is dangerous. [4] No. [2] 
Unknown. It is possible that steroids reduce the production of melanocyte stimulating hormones (MSH).
List of commercial skin lightening / skin whitening ingredients | WHITERskin
2