Gosh, that is great that you have been able to recover from cancer twice. I have read in many areas on alternative health that diet is the most important thing when healing from cancer. I'm trying to eat at least 75% of my diet in raw foods and to avoid processed foods of any type. My aunt died this year of colon cancer and I believe that she could have avoided it if she had changed her diet.
The pad on my chest did change color just like on the bottom of my feet except it was much dryer and there were places that didn't change. I think that was because it was too easy to crease the pad in that location which caused some places on the pad to not maintain total contact.