Has Chuffey been to the vet yet? If not, this would be a good time to get a general check-up done as well as have the parasites identified and treated. Info on finding a good vet: http://guinealynx.info/guinealynx/findingavet.html
It sounds like lice or fur mites. Mange mites cannot be seen by the naked eye.
- Knee Deep
Poor itchy piggy needs your help.