Of course dimples are a birth defect. The majority of the population doesn’t have any! I don’t have any! And most importantly, I think people who do are just plain weird and icky.
Really, though, I pity them. I mean yeah, I know I’ve heard from a lot of people who do have dimples and they’ve pretty much said that they’re okay with their condition and some even say they like it, but deep down I can tell they have to be suffering.