HELP Pinhole in my OIL Tank all suggestions welcome

[Streetbobber74]

so i took my bike (46WL) out for a ride tonight, nothing out of the ordinary, normal range of speeds, hit 55-60 at one point. when i got home i found oil leaking from under my tank, after closer inspection, i found a pin hole with the paint worn off from my tank. any info on how this could happen and how to go about fixing it. i just finished working out some other minor problems and now this. here are some photos.all suggestions are welcome. thanks
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