carbunkle

Noun

carbuncle (plural carbuncles)

1. (archaic) A deep-red or fiery colored garnet or other dark red precious stone, especially when cut cabochon.
   • With eyes like carbuncles, the hellish Pyrrhus […]1602, William Shakespeare, Hamlet, act II, scene 2, line 401
2. A charge or bearing supposed to represent the precious stone, with eight sceptres or staves radiating from a common centre; an escarbuncle.
3. An abscess larger than a boil, usually with one or more openings draining pus onto the skin. It is usually caused by staphylococcal infection.
4. An unpopular or ugly building; an eyesore.