What is this?

Thank you for your question and photo's.  It appears to possibly be a dissolving suture (spitting suture)that makes it's way out and appears like an in grown hair or pimple.  It is harmless and can be trimmed by your PS nurse, or if left alone , it will dissolve on it's own.  

Great Question! Looks as though you are trying to "spit a stitch" This happens sometimes and nothing to be afraid of. It should heal up on its own over time. Keep watching incision- if you see a stitch call your doctor and they can take it out. Should not hurt your healing process. Continue to do scar massage and scar gel to help your scar. Good luck!