Green stools often indicate that food has passed through the intestines faster than normal before it could be changed from green to brown. Diarrhea decreases colon transit time, so any condition that causes diarrhea can result in green stools. Other causes of green stools are:-laxative use, antibiotic use, medication side effectsfood poisoning, celiac disease, ulcerative colitis, Crohn's disease, malabsorptionirritable bowel syndrome, bacterial overgrowthinfectious diarrhea - salmonella and giardia in particular anxietytraveler's diarrheaFoods and supplements that can cause green stools include:chlorophylliron supplement
If it was just few drops of blood , then nothing to worry, however if you have 1tsf or more blood then you should see your Physician for further evaluation .
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