Food pigment: It could be vegetable pigment from your food: beets for example. It might be blood from inside lesions: colonic polyps, colonic cancer, urinary bladder benign and malignant tumors.
Answered 4/26/2015
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A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
2 doctors weighed in across 2 answers
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