Corrosion on new charger point

Thanks for the suggestion but I was hoping for something simpler. Like the nail-polish that someone mentioned here. Would that work without doing any damage?

I mean not being able to use it for running or generally workout (if sweat makes such damage) kind of degrades the devices usefulness a lot .. From my perspective it is exactly the reason I purchased it. Being able to track my workouts in a privacy-friendly way.