Hello, As you said that your son is having constipation, which is a very common problem in kids, he might face a little tear while passing hardened stools. this might seem like a brigh red colour streaks on stool. Another cause of blood in stool can be dysentery , but here the blood won’t be bright red and also will be quite foul-smelling. This is caused due to infection. He might have a fever and stomachache along with this finding. So the best way to cure constipation is to add more fiber in his diet and also at the same time keep a check on hydration. He should be drinking plenty of fluids. In case you suspect dysentery, please consult your doctor for antibiotics. Hope I have answered your query. Let me know if I can assist you further. Take care Regards, Dr Gaurav Nigam, Pediatrician