If it really bothers you, touch it up. If you are going to use it, more scars will appear. 
does your new glock have the new matt grey "parkerized" type finish? if so, that one receives scratches if a gust of wind hits it lol. glossy black, and glossy grey ones are tougher. glock has been mixing and matching finishes recently for some reason.I just recently purchased a new baby glock and upon inspection I found a small finish marr and I was wondering if any of you have any experience with a touch up like the birchwood casey touch up pen? Any help is appreciated
Glock's original Tenifer coating hasn't been used in the United States for quite a while... It has been replaced with another hardening process that is less toxic... Don't confuse the Tenifer process with the external coating you see on the slide... The old shiny black and new flat black coating on Glock slides is not part of the hardening/Tenifer process. I like the flat black coating better because it isn't as slippery as the shiny surface... Unfortunately it also seems to be less durable.At the Glock Armorer's Course I just attended last month we were told by Glock that they no longer use the tennifer treatment on any Glocks manufactured in the last two years. We were assured that the new Nitrading finish should be just as hard as the Tennifer was.
My experiences with newer Gen 3s & Gen 4s as Armorer are that the newer ones scratch much easier and may be more prone to rusting. My advice is to refinish slides and barrels with aftermarket tough finishes like NP3.