Kit-of-parts comprising an arbutin-containing composition comprising: (i) an aqueous phase comprising: water; a preservative in an amount from 0.01% to 5% by weight of the total composition; a chelating agent in an amount from 0.01% to 5% by weight of the total composition; a humectant in an amount from 1% to 20% by weight of the total composition; an emulsifier in an amount from 1% to 20% by weight of the total composition; a pH adjustment agent in an amount from 0.01% to 5% by weight of the total composition; and a reducing agent in an amount from 0.1% to 10% by weight of the total composition; and (ii) an oil phase comprising: an emollient in an amount from 2% to 25% by weight of the total composition; a preservative in an amount from 0.01 to 5% by weight based on the total composition; and an antioxidant in an amount from 0.1% to 2% by weight of the total composition; and wherein arbutin is present in the composition in an amount from 5% to 10% by weight of the total composition; and a composition containing tretinoin. an arbutin-containing composition comprising: (i) an aqueous phase comprising: water; a preservative in an amount from 0.01% to 5% by weight of the total composition; a chelating agent in an amount from 0.01% to 5% by weight of the total composition; a humectant in an amount from 1% to 20% by weight of the total composition; an emulsifier in an amount from 1% to 20% by weight of the total composition; a pH adjustment agent in an amount from 0.01% to 5% by weight of the total composition; and a reducing agent in an amount from 0.1% to 10% by weight of the total composition; and (ii) an oil phase comprising: an emollient in an amount from 2% to 25% by weight of the total composition; a preservative in an amount from 0.01 to 5% by weight based on the total composition; and an antioxidant in an amount from 0.1% to 2% by weight of the total composition; and wherein arbutin is present in the composition in an amount from 5% to 10% by weight of the total composition; and (i) an aqueous phase comprising: water; a preservative in an amount from 0.01% to 5% by weight of the total composition; a chelating agent in an amount from 0.01% to 5% by weight of the total composition; a humectant in an amount from 1% to 20% by weight of the total composition; an emulsifier in an amount from 1% to 20% by weight of the total composition; a pH adjustment agent in an amount from 0.01% to 5% by weight of the total composition; and a reducing agent in an amount from 0.1% to 10% by weight of the total composition; and water; a preservative in an amount from 0.01% to 5% by weight of the total composition; a chelating agent in an amount from 0.01% to 5% by weight of the total composition; a humectant in an amount from 1% to 20% by weight of the total composition; an emulsifier in an amount from 1% to 20% by weight of the total composition; a pH adjustment agent in an amount from 0.01% to 5% by weight of the total composition; and a reducing agent in an amount from 0.1% to 10% by weight of the total composition; and (ii) an oil phase comprising: an emollient in an amount from 2% to 25% by weight of the total composition; a preservative in an amount from 0.01 to 5% by weight based on the total composition; and an antioxidant in an amount from 0.1% to 2% by weight of the total composition; and wherein arbutin is present in the composition in an amount from 5% to 10% by weight of the total composition; and an emollient in an amount from 2% to 25% by weight of the total composition; a preservative in an amount from 0.01 to 5% by weight based on the total composition; and an antioxidant in an amount from 0.1% to 2% by weight of the total composition; and wherein arbutin is present in the composition in an amount from 5% to 10% by weight of the total composition; and a composition containing tretinoin.