Thanks for the suggestions guys! I do carry the firearm but no part touches my skin and I do take it out quite a bit. It does seem like pitting and I don't like the idea of ruining the finish by essentially sanding the slide. I feel like oiling the firearm will simply take away the rust color and not actually treat anything, otherwise body shops would be out of business right?! "poor some oil on that ole ford".
I will try calling glock back again tomorrow.
"quite a bit", really you should never store the gun in the holster. Still, that shouldn't cause that problem but get in the habit of taking it out every night when you take the gun off so it's not sitting in a sweaty mess all night long. Gives the holster a chance to dry out too.