Too much UV radiation IS harmful for your skin unless you use sunblock.
@OP: My mom always tells me to stay away from the microwave lulz. I dont have any facts to argue otherwise, nor do I wish to make a scene or cause any drama, so I just stay the hell away lols. I always leave my food to cook and come back to grab it later anyway.
Never had my parents tell me to stay away from the microwave but nor have I ever had the desire to sit inside of it as that is the only way you're going to get damage at all from it.
Going to get Mythbusters on this.
"There once was a boy who dreamed of being a hero. Who believed sincerely in the battle to banish darkness from a world of light... but light and darkness are equal... and where one exists so too must the other... and when the boy finally realized this he had taken the first step toward being a true hero."