Adding -s is the most common. for example: books, cups, pencils, etc. -es might have been the one that confused you, but that isn't a super common ending for plurals--instead, a more common one would be "-ies" which is when you drop the y (berry becomes berries, for example).
Try getting those swim suits with long sleeves, or if it’s on your legs, theres, I think, long ones for those too. Search for them on Amazon. Another way is to just use waterproof makeup and try to cover it up. A lot of people just use makeup to cover them
I agree with ur answer....under the surface...because of the context " drilled into the ground "