text: does anyone know how to treat hogweed burns ????   depending on how severe it is, you should consult a physician.  it can leave permanent scarring.  you should wash it (before blisters break out) and keep it from being exposed to sunlight for up to 2 weeks.   cold compresses are recommended.  here's a site that talks about it, somewhat. mostly the 2nd half of page 1, continued on page 3.