Wow. Breast cellulitis! Haven't heard of that. I got cellulitis in my hand durning chemo. My joints are still red and stiff and a bit sore. Takes months to clear up I believe. I had 4 courses of anti biotics and now just rub Voltaren gel into it which has reduced the swelling a lot.
Not sure how you can prevent Cellulitis. It occurs from an infection but because your immune system is pretty low, it can't fight the infection normally, so cellulitis can result. It's terrible isn't it!