Sorry I've been away for a while, we've been trying to get as much as possible done before this weather breaks!
To make a bread poultice just heat some milk and pour onto a slice of bread, use white for this even if you never normally eat it. Make into a mush and wrap In a piece of muslin if poss, or old sheet, hold onto the affected part and try to leave until it dries. You may be able to tie it on. It gets easier with practice. Put it on as hot as possible without burning him, I don't know why it works, but it does. So sorry not to have got back before.