blemish

Noun

• a mark or flaw that spoils the appearance of something (especially on a person's body)
  • a facial blemish
    

Verb

• add a flaw or blemish to; make imperfect or defective

• mar or impair with a flaw
  • her face was blemished
    

• mar or spoil the appearance of
  • scars defaced her cheeks
    
  • The vandals disfigured the statue
    

Related words

• Synonyms: 
  defect , mar , flaw , spot , deface , disfigure