[quote name='Roland Rock' timestamp='1440625051' post='2852566']
How does this happen? You say that part never gets touched?
[/quote]
My first thought was slap impact, but the damage is between the G and D strings (the OP appears to be left-handed), so I don't think that can be it.
Second guess is fingertip impact, but only if that's where the OP actually plays - thumb on the top of the neck pup could put fingertips in a position to produce wear like that, especially if the action is low. So could slap+pop.
Third guess is a resonance effect, but that is definitely a long shot.
This is all pure speculation, obviously