dry flakey skin

My doves feet are dry and flakey. What could cause this? Is this normal? How do I treat him if he doesn't let me touch his feet?

hi i've got an older woodpigeon that somone gave me last year,,they had her for several years but could no longer keep her...it cant fly due to a previous injury i believe... just noticed shes limping badly and on looking her foot is covered in thick white dry flakey skin...only had one pigeon...