I only know how it’s used for psoriasis as part of the Goeckerman method [1] but allegedly there’s some general anti-inflammatory effect.
Another weird/fun one is using bleach as an anti-inflammatory (topical only, of course...), although these days you can find derivative products that offer the same benefits but are much less harsh.
Not to be done too often but every once in a while I find it helpful. Not all that different from a strongly chlorinated pool.
Another cool one, especially if you don’t have a sauna, is doing a mustard bath. You will sweat like a stuck pig
So many questions...
American, English, or Dijon?
*Sponsored by Heinz? ;)
Pour that in a warm bath and soak for 20 mins. Then get out and wrap yourself in a towel and continue sweating for 15 mins or so.
Sounds like you're making human soup? :)