“…Since Kligman et al [10] reported that the combined use of topical atRA, dexamethasone, and hydroquinone was more effective as a depigmenting formulation than a single use of each reagent, hydroquinone has been widely used in combination with atRA and corticosteroid [4,18]. Furthermore, in recent years, hydroquinone has been used in combination with laser therapies [1,2,8], dermabrasion [20], and chemical peelings such as Jessner's solution and glycolic acid [3,5,13,14].…”