I got a breast injury on my right breast 4 years ago and ever since there has been a dark spot or scar on it and it is still there and has not changed?

Here are some...: Apparently, the healing process after injury optimized by 2 years. At least, the injured site has remained stable/unchanged; that is good. From now on, just watch and see, and there is no practical reason to worry anything to it. Meanwhile, just do breast self-examination with no need to be overly anxious. More? Seek evaluation and counseling timely.