blotch
n
large discoloured mark, usu irregular in shape (on skin, paper, material, etc) (皮膚、紙張、材料等上的)大斑點
His face was covered in ugly red blotches. 他臉上有許多難看的紅色大斑點.
When a student recently saw two workmen using a pneumatic drill outside his university, he immediately telephoned the police and informed them that two students dressed up as workmen were tearing up the road with a pneumatic drill.