carbuncle[noun]Synonyms: abscess, boil, furuncle, pimple, pustule
 [TahlilGaran] English Synonym Dictionary ▲
 car‧bun‧cle /ˈkɑːbʌŋk
əl $ ˈkɑːr-/ 
 noun [countable][
Date: 1200-1300; 
Language: Old French; 
Origin: Latin carbunculus 'small piece of burning coal', from carbo;  ⇒ carbon]
1.  a large painful lump under someone’s skin
2.  a red jewel, especially a 
garnet  [TahlilGaran] Dictionary of Contemporary English ▲