I have been having strange intestinal feeling. my stools have been kind of hard to pass which i believe is constipation. but when i wipe after having a bowel movement every time it has black pepper like specks on the paper. should this be concerning?

Can call Dr on video: A constipated teen needs to be sure there is no other disease causing it. If constipation is just due to slow movement of the food and poop through the gut, then the things to try are vegetables, water, prune juice, prunes, fiber plus water, Miralax (polyethylene glycol), Senokot or other senna, milk of magnesia, other laxatives... Teens rarely have a concerning problem, but should chat with Dr.