Have you tried N-acetyl-cysteine as a daily supplement 500-1000 mg daily? It helps the liver detox so the toxins don't spill out through the skin. I started using this when I was detoxing bromide from iodine supplementation. It helped clear up the bromide acne. It's good stuff. It is used by hospitals for acetaminophen overdose. Milk thistle and dandelion help support the liver too. You can get the milk thistle seeds and munch on them or grind them up. Dandelion leaves you can eat in salads and make tea from the roots.
Have you thought about getting regular chiropractic adjustments. When my back is out, my face breaks out. Do you by any chance have scoliosis?
Are you taking any A (not beta carotene) and D supplements?
iolite
Also, over on Trapper's forum, someone posted about tumeric being good for boils.