I’d get some milk thistle which will help the liver detox as well. There is a potent version that I like called super milk thistle X by integrative thereaputics.
Additionally, Dr. Mcoombs feels that anyone who has skin problems lacks HCL (hydro-chloric acid) and if you supplement yourself with something like zypan or betaine HCL, you likely will notice an improvement.
Vitamin C is also great for the skin and detoxing and this likely will help.
I’d also consider acupuncture which can get the body to rebalance itself, heal specific organs, and help detox.
Sweating out the toxins likely will help your skin and detox:
The sulfur found in mineral springs heals skin conditions and your rash would likely go away completely if you went to a hot mineral springs.