poultice

Short definition from Wiktionary

Noun

1. 1
   A soft, moist mass, usually wrapped in cloth and warmed, that is applied topically to a sore, aching or lesioned part of the body to soothe it.
2. 2
   A porous solid filled with solvent, used to remove stains from porous stone such as marble or granite.

Verb

1. 1
   To treat with a poultice.