Is this issue present only in that one specific location? -- look under a light and "swipe" the light's point source across the finish. Looking at the edge of the light as it moves across the surface is the easiest way to see all the imperfections.
If this issue is only in that one location, a couple things come to mind. The first would be deodorant/cologne/moisturizer -- any type of product you put on your skin. The other is sweat. Some people's skin/sweat is really rough on nitro and a lot of chemicals can damage nitro as well. So try and isolate the cause and make sure you avoid it in the future. Your clothing isn't a problem as the surface is "raised" rather than scratched. Detergent could possibly be a problem - do the clothes come out of the dryer with a strong scent and remain that way?
Wiping with a damp cloth after playing the guitar is always a good idea.
In terms of repair -- you need to level and buff. Lots of different products out there that will all yield good results by hand. However, if you have a local repair shop that can do this for you - I recommend taking it to them.
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