Hi, ACJ,

This is a very painful and dificult problem. It must be frustrating going through so many tests and not being able to get to the bottom of this problem. I wonder, how did the specialist believe ceasing breastfeeding would solve the problem? I found this interesting article. Boils and carbuncles: Risk factors - MayoClinic.com
Generally, when pregnant women are slightly immuno-supressed. It is a common myth, even in the medical field that "breastfeeding takes it out of you" In fact this is not the case, and formula feeding mothers are often more fatigued than bottle feeding mothers, and have more demands on their body (menstruation returns) A breastfeeding woman's body uses nutrients very efficiently to produce milk for her baby, and provides hormones that help the mother rest.
I wonder if you have eczema, or any other of the risk factors mentioned? Have your doctors discussed ways of supporting your immune system?
Let us know how you go - it's a difficult problem.