Defect

Want or absence of something necessary for completeness or perfection; deficiency; -- opposed to superfluity.

Failing; fault; imperfection, whether physical or moral; blemish; as, a defect in the ear or eye; a defect in timber or iron; a defect of memory or judgment.

To fail; to become deficient.

To injure; to damage.

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