Blotch

Blotch

n.
  1. A blot or spot, as of color or of ink; especially a large or irregular spot. Also Fig.; as, a moral blotch. [Fig.]
    Spots and blotches . . . some red, others yellow.
    — Harvey.
  2. A large pustule, or a coarse eruption. (Med.)
    Foul scurf and blotches him defile.