The reason is this. The problem is caused by melanocytes deep in the dermis of the skin coalescing due to damage of some sort (sun, etc.). To correct this, you must get these melanocytes to come to the surface to make the bleaching cream or serum effective, and for this a retinoid is necessary. Retin-A works but is a prescription item. But our Bare Skin Care Program for Hyperpigmentation has a very effective retinoid in the form of retinaldehyde in our "A" serum. It also contains several bleaching agents, including Hydroquinone. In addition, this program has everything necessary to moisturize your skin, bring it back to a beautiful, even tone, and lighten the skin.
I have used this program in my med-spa and seen it be effective in as little as one week. Currently you can get the entire program of seven (7) products at a 15% discount by using the Code "Summer18". Use this link: https://bareskincare.com/collections/skin-care-programs/products/bare-skin-care-program-for-hyperpigmentation.