I have just been given two chickens and both have scaly leg. they are quarantined from the others.
popped into the vets and asked advice
he stated don't do injection or drops, but surgical spirit weekly for 3 weeks and vaseline on legs every day for same period
did it today and neither bird gave any indication of discomfort.
one thing i did see on the net re the spot on is don't eat the eggs for x amount of time after its use