The way wounds heal depend on many factors, including
- mechanism of injury (knife, scalpel, burn, caustic fluid, blunt trauma etc)
- location on the body (the extent of skin movement and tension will determine how things heal)
- how was the injury treated (you say your wounds were not stitched...)
- your ethnic background (the darker the skin, the more vigorous the healing response)
- genetics (if your parents have a history of REAL keloids the odds are you will as well)
Most people refer to ALL raised scars as "Keloids". That is NOT the case. A scar that is raised from the plane of the skin, resembling a speed bump - that is it does not exceed the limits of the original injury is SCAR HYPERTROPHY. On the other hand, when a scar exceeds the original injury, such as ear punctures that result is cherry-like scars - those ARE real KELOIDS.
If your neck skin is soft and supple, you may want to see a plastic surgeon (www.PlasticSurgery.org) and have him try a SCAR REVISION on you. It MAY correct these scars nicely. I would NOT do it if you have true keloids or the wounds have not yet totally matured.