The picture is out of focus, but it looks like a keloid. A keloid is a growth beyond the borders of the scar that created it. Some keloids are spontaneous and not elicited by trauma or surgery. It is an excessive growth of thick collagen that has its origin in genetic predisposition. They are more common in the upper body, chest, shoulder, areas of constant extension and contraction.
Could be the beginning of a Keloid scar but for sure it is a hypertrophic scar. Try steroid injections to the area. And compression with scar creams...
You should show this to your doctor right away. There are several possibilities including hypertrophic or keloid scarring, infection, or a reaction to suture material. Let your doctor examine the area in person so that you can get a better answer and appropriate advice. Good luck.
The photo is very bad but it looks like a keloid indeed... Try to have a steroid infiltration and a fractional laser treatment!