Hard lump after stitches was it the Novocaine

Patient: Sorry for my grammer. so i got a Swollen lip and stitches right above my lip(3 stitches) (on the 5th day i got em out).what they gave me was Novocaine for the pain (it was SO PAIN FULL GETTING THE SHOTS). so after ~5 days the swelling whent down down but by placing one finger on the inside and one on the out i fell a hard lump (like a rock)

Symptoms: hard lump (like a rock)