I wormed my whole flock the other night including my roo, with ivermectin. I still need to do something about my roo's swollen feet. A "chicken doctor" told me it was scaly legs mites, even though it's not a classic presentation of scaly leg mites. I've tried just about everything else - vaseline, etc. - with no improvement. I want to try using ivermectin mixed with oil and paint his legs with the solution. How long do I need to wait to use the ivermectin again after worming him on the back of the neck?