This rash, so called because in appearance it resembles the swelling
and redness caused by the sting of a nettle, is generally produced by
a disordered state of the stomach.
_Medicines_. Aconitum napellus, Nux vomica, or Pulsatilla, in
ordinary cases; Arsenicum is useful if there be much fever; Belladonna
if the rash is accompanied with headache.