I have just been diagnosed with DCIS and that was how I discovered it. Burning first. The pain came later. I did not mention it for a year, until I felt the lump. I was under the impression that cancer was painless. The breast expert\ surgeon I saw told me that is a fallacy. The lump is in my left breast and is Very painful. The burning continues and has started in the right. He has ordered a breast MRI to be done before the lumpectomy which is scheduled before the end of July. He said that was the best way to find any breast cancer.