I'd imagine you could probably use any kind of cover-up on it. It's just a matter of how well it'll hold up to the conditions. Heat and moisture being the biggest concerns. It'd be an expensive thing to maintain though. My girlfriend's concealer is at least $10 for a tiny bottle, and it's a cheaper brand I think.
Is it more you seeing them that bothers you, or other people seeing them? If it's the latter, you could always come up with a bunch of outlandish lies like I have

Small children at the pool are nosy. So far I've told them I've been in a fight with a bear, crashed a helicopter, and had frostbite. Literally none of these things explain them, but it makes them shut up and move along.