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the builders
Congenital or structural defects.
From Wikipedia:
"The color of a diamond may be affected by chemical impurities and/or structural defects in the crystal lattice."
You can read more about what impurities and defects cause which colours, below.
Growths, tears, anal fissures, or congenital structural defects can be found inside the rectum with DRE
Congenital Heart Defect is a descriptive name. Congenital means present at birth. Defect means a structural problem or abnormality.
Specific defects, combinations of defects, and surgical repairs are often named after the doctor who discovered them.