yeast rash under breast

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I have what I suspect is a yeast rash under my right breast, It looks a lot like my son's yeast rash that he had on his bum that I treated and is now okay. He has no thrush.

I am wondering if I can use his rash cream on my rash. My main concern is that I am exclusively breastfeeding him so not sure if it might not be okay for that - external vs potentially internal. It is a combo of Nystatin and Hyderm 1%. Obviously I'm going to go see my doctor but since it's the weekend I can't get in until at least Monday. Does anyone know if it's okay?

What can I do to avoid giving it back to him, and are there any home remedies that might help in the meantime? It's not terribly itchy but I just don't want to be spreading it around. Do I have to worry about it on my clothes and towels, and do I have to treat them somehow to make sure I'm not spreading it? I've done some googling but I'm not really finding the answers.

Thanks!