I will also say lice. Have you really dug through all that hair and looked on the base? They are sometimes not that easy to spot. Here in Tennessee I have special lice....tee hee......they are sneaky and for a while I wasn't sure until I put my glasses on and then went "OOH looky thar"
even if it's not lice, it can be another stupid mite so I dust with 7 dust and get it down in there deep and also use ivermectrin