Sarcoptic mange mites. www.ratguide.com
Treat with ivermectin horse paste and Frontline spray(NOT the concentrated drops). Generally 2 sprays per rat is good, then rub all over and let dry. Horse paste dose is uncooked grain of rice sized dose per rat per day for 2-4 weeks.
Clean all cage furniture with bleach and clean bedding often. Bake or freeze bedding before using. DO NOT spray it with any chemicals...
Be sure to treat all of the rats in the colony or it will come back.
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