Hi I've just noticed that my 4yr old daughter has a small dark brown spot on the underside of her upper arm, I've never noticed it before and I'm 99% sure it's appeared in the last week or so. I'm not sure if it's a freckle or mole, I don't think it's raised but if it is is very slightly. Do moles/freckles just appear or should I be concerned and take her docs, feel a bit ridiculous going just for a freckle or mole