Does a Mini Lack Platzer have to be treated?

Moin, next to my parking lot is a small metal railing. Normally I am careful and wanted to do some rubber over it, so that I don’t hit the door, because I have the parking lot only recently. Now it happened to me today, however, that I came against quite easily. With the naked eye you don’t see much, if you go over with the fingernail you notice a small placer. With very close access you can recognize from certain angles and exposure nevertheless a cleavage In the hole (not even half a millimetre in diameter). I tried to wipe over with a microfiber cloth, didn’t go off, so it’s probably the paint that’s there. Since my car color is grey, I don’t see how deep it is. We can go out for the first time that it’s all over the sheet metal. The question is, does this have to be repaired somehow? The vehicle is very new and has to be delivered in 3 years (leasing). I don’t want this to happen because of such a micro Loc h starts to rust or something. In the meantime I have covered the railings already, so that I don’t fight… Unfortunately only too late. On occasion I will attach a picture.