My sister fell a few years back and was left with a displaced elbow fracture. Surgery was performed about a week after the injury, and rods and screws were placed in her arm.
Alarmingly, intense sweling and discoloration occurred in her wrist area. The doctor kept telling her this was normal, but the problem only got worse instead of better. As it later came to light, she had developed RSD from either the injury or surgery.
In short? Always seek out another opinion if you believe a wound is not healing as it should; it will better put your mind at ease.