This very useful tool will help you quickly bleach very dark and difficult areas that need to be covered by clothing. Areas like nipple/areolas, elbows, and knees. And also dark marks on difficult & awkward areas of your body. Like if you have a very dark burn mark on your thigh, back, or butt-cheek. You would apply your skin bleach to the area, then cover it with this silicone cup. The adhesive side will stick to the skin (not covered with skin bleach) and keep the skin bleaching cream/serum from being wiped off or smeared away. The silicone cup will also cause the skin bleach to penetrate deeper (same as using plastic wrap or disposable gloves) and cause the skin to whiten even faster.