A deformity, dysmorphism, or dysmorphic feature is a major abnormality in the shape of a body part or organ compared to the normal shape of that part.
Causes
Deformity may arise from numerous causes:
Genetic mutation
Damage to the fetus or uterus
Complications at birth
A growth or hormone disorder
Reconstructive surgery following a severe injury, e.g. [Source: Wikipedia 
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