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It would depend on where they are. If they aren't hidden under your bikini or swimsuit then it will be difficult. You can wear some kind of wrap when you're not in the sea or you could even wear a t-shirt in the sea but there is not much that you can do to cover skin. As an outside bet you could cover them in sun lotion so much that they aren't visible.
Far easier would be to just own them. Don't feel like you have to hide anything. You don't owe anyone any explanation, they don't live your life. Forget about them and have fun. Fuck what anyone thinks.