I wouldnt, also ducks can have that from when they were hatched and it takes a few weeks to fully notice. Give it vitamins and electrolytes in the water to help heal if it is an injury and have a good layer of bedding so its not slipping around while walking.
Extracted From:
A Pocket Guide to
Poultry Health
and
Disease
By Paul McMullin
2004
Click Here to
Order Your Copy
Introduction
A fungal infection, Trichophyton gallinae, of chickens and turkeys. It is very rare in commercial poultry production.
Signs
White, powdery spots and wrinkled crusts...
I am in the business where I answers poultry questions 9 hrs a day, but I would Like to answer questions for my BYC community, and hopefully learn things too. Please post me questions I would love to Help :)