No scar: The uterine lining, the endometrium, gets thicker during the first half of the menstrual cycle such as to provide a cushion for a fertilized egg to implant. When there is no fertilized egg implanting, the uterus with contractions (cramps) loosens and sheds the inner lining, making clots appear in menstrual blood. This process is not associated with scarring.
Answered 7/23/2018
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