Can chickens get verrucas?

Hi any one know what I can treat my Bluebell hen with she has two callous's on her foot and is limping because of it.  I have put hydrocortisone cream on it but it looks more like a verruca?   Any advice she's a great layer and good hen.

Thanks have read the link you sent and looks quite likely to be bumble foot, have already got her separated and will dress it now to protect it and vet's monday x thanks for advice.  It wasnt from the roosts but could have been their water feeder will check for sharp edges