I have had the same thing happen after a flush, I will get a rash on my inner arms. In homeopathy and even some holistic doctors say that healing happens from the inside out. An idea of this is a baby with eczema (skin) which turns deeper, into allergies (gut), that turn deeper into asthma (lungs). And as the body heals the disease comes back out through the skin.
I still wonder how true this is, but I have seen it many times in healing myself over the last 4 years.
Newbe