blind piles

from The Collaborative International Dictionary of English v.0.48

Piles \Piles\, n. pl. [L. pila a ball. Cf. {Pill} a medicine.]
   (Med.)
   The small, troublesome tumors or swellings about the anus and
   lower part of the rectum which are technically called
   {hemorrhoids}. See {Hemorrhoids}.

   Note: [The singular {pile} is sometimes used.]
         [1913 Webster]

   {Blind piles}, hemorrhoids which do not bleed.
      [1913 Webster]