RWT Concentré Treating & Whitening Egg Yolk Serum. 

Main Function: Eradicates freckles, age spots, and liver spots while brightening the complexion.
Application Areas: Commonly used for spot correction on stubborn areas like knees, elbows, toes, and knuckles.
Usage: Typically applied directly to the affected parts using a cotton pad or mixed into a standard body lotion to boost its clarifying effects. [1, 2, 3]