Sounds like it could be bumble foot caused by jumping from a high perch onto hard ground Cjnewton. Perches should be no more than 18 inches high, preferably with a soft landing underneath like wood shavings. It can develop into an infection in the ball of the foot.
Heavy breeds are most likely to suffer and our old Orpingtons don't like to perch at all. Even on the 9" high ones provided, which have since been taken out.