poultice
noun /ˈpəʊltɪs/
  /ˈpəʊltɪs/
- a soft substance spread on a cloth, sometimes heated, and put on the skin to reduce pain or swelling 
- to apply a poultice
 
Word Originlate Middle English: from Latin pultes (plural), from puls, pult- ‘pottage, pap’.