Haha, my guess is ant lion, too.
They did tiny perfect little cone shaped holes in the dirt - by kicking dirt or sand out - and they wait just under the dirt at the bottom - for an ant to fall in - thus "ant lion".
If the other guys are right, however, get the shampoo and/or see a doctor. And stay away from... Katie is it? Not sure who she is, but it sounds like she has a, um, a reputation to say the least.