I had a mole removed on my back. That was about 7 years ago now and there is still a visable scar. It is called a keloid scar which is different to a regular one, im no expert though. My sister also had the same and her keloid scar was quite raised and still is now. I would go see a dermatolagist if you are worried. It didnt cost me anything cause in the UK we pay health insurance automatically.