Chuck,
I agree with Mark. You need to be sure you are comfortable with what this doctor is saying. And, personally, I find it hard to believe that a biopsy is going to cause very much "unnecessary destruction of normal tissue". If things start to improve, go back in a month. But, if things don't start to improve within a couple weeks, I wouldn't wait a full month. Just my 2 cents.
Rainbows & hugs,
Rosie