My son has a tiny black thing stuck in his upper thigh, i tried to pull it out and only the top came out almosy like a scab but it is jet black?

Foreign body : A foreign body like a splinter or spine off a plant may be difficult to get out & can seem fine in the beginning. However they often drag germs deep into the tissue & eventually produce an infection that can spread into the body. In my office i often need a local anesthetic, good light & equipment to get the remaining material out of the deep skin or deeper layers. Have him seen.