I have 4 stitches just below my lower lip from the accident 270oct 2017. the other 3 stitches have healed nicely except 1. this one is so painful in a way that i cant event touch it. it has some redness a swelling. i seek advice on treating this?

Specialist can help: A facial laceration, after healing, can trap stuff inside the wound. Sometimes, surface skin cells got trapped under the skin. Over time, the cells multiply and form a cyst under the skin, which should be removed. Sometimes, a foreign object (plastic, metal, wood, etc.) is trapped under the skin and causes chronic inflammation, and needs to be removed. An ENT or facial plastic surgeon can help.