If the black suture grows into the flesh, it is usually fine if it is an absorbable suture. If it is a non-absorbable suture, then there may be something wrong, and you need to go to a regular hospital to have it removed.
If the absorbable suture grows into the flesh, it is usually harmless to the human body, because it has good biocompatibility. It can be gradually absorbed within the wound, avoiding the risk of removal, as long as there is no subcutaneous foreign body reaction is usually not a problem.
If a non-absorbable suture grows into the flesh, it is easy to remain in the body and may cause wound infection as well as pain at the wound, which is not conducive to wound recovery. Since bacteria may be present in the suture, it can lead to wound infection and scar tissue growth after a long period of time.
That is why it is said that the stitches grow into the flesh and need to be removed under local anesthesia if necessary. After the sutures are removed, local changes in the wound should be observed at all times. Meanwhile, wound care measures should be taken to reduce bacterial and viral attacks by regular anti-inflammation.