Cast iron pans and other tools on the countertop
Explaining The Rusty Spot On Your New Lodge Cast-Iron Pan
If your newly bought Lodge cast iron pan has a brown-tinged discoloration, it isn't rust. It's actually the result of the manufacturer's seasoning process done prior to the sales.
At the factory, the pans are hung on a ring and sprayed with oil. Sometimes, the application is a bit irregular, mainly around where the pan is hung, causing oil buildup.
So, that brown spot is not rust, but rather a small blob that'll smoothen away with time. Simply throw it onto a range and cook with it often to make your cast iron pan better.
While such rust-like discoloration may occur with the cast iron pans of other brands, too, it surprisingly seems to be more common with the Lodge products.