I used to get the big welts that you are talking about as well as smaller papules, and I have done two flushes now and my skin is as good as it has been in months, even years. I haven't had a large welt since my first flush, and the second flush seems to have improved the smaller bumps too (I did my second flush just last weekend).
Also, I used to get the large bumps on my back - just one or two at a time - I haven't had one since I did the first flush at the beginning of January.
Anyway, if it doesn't work at least you can say you tried. But it won't hurt, and it is a cheaper option than AcneCured.