Hello. I Have Big Breasts And They Tend To Sweat

Hello. I have big breasts and they tend to sweat of course. But I have a dark like patch in between them like I use like I've used skin discoloration cream but it doesn't seem like it's getting better what can I do? I want it to match the rest of my skin complexion and not be darker when I wear low-cut shirts or something of that nature.