Re: Why does taking probiotics cause hives?

That can be from substances released by bacteria or fungus that the body may be allergic to. It can also be from the probiotics increasing immune system function. If the skin condition is related to immune system weakness or overactivity, it affect the symptoms experienced in the skin.
Taking fish oil and vitamin E help the skin and help to manage inflammation. Keep doing the sweating to facilitate elimination of toxins so that they don't become backed up.