Hives or Nettle Rash, Slippery Elm For

"Slippery elm used as a wash and taken as a drink." Slippery elm is especially good for
any skin disease, as it is very soothing to the parts and relieves the itching. If taken as a drink it acts on the kidneys and bowels, throwing off all the impurities.

Source: Mother's Remedies: Over One Thousand Tried and Tested Remidies from Mothers of the United States and Canada, T. J. Ritter