Probably nothing : Most likely hemorrhoidal bleeding. Many things can change the color of stool - most being benign. If persistent or if you have other symptoms i would suggest being evaluated.
Answered 10/14/2012
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2 doctors weighed in across 2 answers
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3 doctors weighed in across 2 answers
2 doctors weighed in across 2 answers
A doctor has provided 1 answer
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