These is a vague terminology and makes no sense. Kindly do not fall into the hands of such therapists. I think no Dermatologist will recommend you something like this. Basically there are depigmentation treatment protocols which modify melanocytes functioning in an orchestrated manner that results in a healthier and better skin tone, This could be a chemical peel, rejuvenation skin lasers or mesotherapy and PRP therapy. Meet a qualified dermatologist in person near you to understand these in more details.