Each individual is different. I have read cases of this being resolved with water-fasting and/or with Iodine supplementation (there is an Iodine supplementation forum also).
Iodine-deficient people create fibroid tumors, cysts, etc.
But, a good cleansing of the body is important, water-only fasting sure fits that bill!
Have you read any of the books? Dr Joel Fuhrman's book "Fasting and Eating for Health" is an excellent one.
If memory serves correctly, I believe he covers un-natural growths within the body.