[Discussion] Cos de Baha Hydroquinone Brightening Serum

Has anyone used this product to fade post acne PIE and PIH? What has your experience been? Also, tips on how to use it: spot treat or all over the face? how much? Do you take breaks as you should with hydroquinone? If so, how often and how long?

https://www.cosdebaha.com/products/2-hydroquinone-arbutin-niacinamide-4-serum-dark-spot-corrector-remover-melasma-treatment-fade-gel-hyperpigmentation-30ml