Need help figuring out what's on my skin (pictures included)?

Sometimes when a wound heals the scar tissue that forms can be irregular and can form something that is called a keloid. I cannot really tell by the picture if this is the case for you. If the bumps appear to be filled with anything, like puss or fluid or if the area surrounding it is red and warm to the touch, then it is likely an infection. In either case, I would see a doctor about the situation. Keloids can be dealt with and obviously if it is an infection or something more worrisome it would be better to be under a physician's care. My gut instinct says it is a keloid which will not harm you but check to be safe.