Likely damage to the joint, colloquially known as a "Knocked up toe" caused by something like a dislocation/over extension of the joint causing inflammation. This is often followed by bony growth/spurs around the joint leading to permanent osteoarthritic changes. Rest, mobilise the joint as much as possible to maintain range of movement whilst its healing, anti inflammatories such as the metacam, to reduce the inflammation and try to reduce structural changes and time.
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