hello all, i was just wondering what may have caused these strange shiny/oily spots on my open pore finish guitar. i did in fact buy the guitar second hand but these shiny spots can only be viewed under certain lighting so i wasnt able to see them in the store. if any one can suggest possible causes and solutions to the issue it would be greatly appreciated. im not sure if its from sweat or abrasion since the shiny spot on the top left is not somewhere i or anyone else would frequently touch to the point of the finish become glossy. thanks in advance for any help