Life is not worth worrying about what you eat. Eat whatever and relax. Just wash your face at night and in the morning. THe more you worry the more stress you'll put on yourself. Trust me it's not worth it.
Doritos won't make you break out, but they aren't very good for you. They sure are tasty though. But with the recent trans fatty acid controversy, Doritos are rather high in those. So they could lead to a higher cholesterol count. Eat in moderation though.