I didn't have the other ones, but I did have a brown wrinkly spot on my breast, the size of a quarter, that peeled a lot. I used to scratch it too and then it would leave a red mark like an open wound. I spoke to my dermatologist and he suggested that maybe my soap was too harsh and it was an allergic reaction. I then switched my soap to an Asian one called Likas Papaya Herbal Soap. I tried an Asian one because all the American ones seem to be so harsh. I use it in the shower with a washcloth and now the spot is COMPLETELY gone. I'd say it took about 2 months for it to be gone completely. It lightens your skin so it should work for the dark spot in between your breasts too. Ask for it behind the counter at any Asian or Filipino store. It only costs about $2/bar. I use it on my face too and it cleared up my acne completely.