I guess I hadn't thought about a kick. I know a bite makes sense but it's such a weird position. I watch all of them while feeding but somehow totally missed this. I watched a rat pup bite my mojave a few weeks ago and when I checked him out, the marks were so tiny I could barely see them which is why I'm second guessing whether or not this is a bite. I guess it's really the only logical explanation. I really just wanted to make sure it wasn't something more serious. I'll pick up some betadine and switch out the aspen for paper towels until he's all healed up. Thanks for the input guys.