Source : Webster's Revised Unabridged Dictionary (1913)

Rubefacient \Ru`be*fa"cient\, a. [L. rubefaciens, p. pr. of
   rubefacere to make red; rubere to be red + facere to make.]
   Making red. -- n. (Med.) An external application which
   produces redness of the skin.

Source : WordNet®

rubefacient
     n : a medicine for external application that produces redness of
         the skin