These usually appear overnight and no way of knowing the cause. It's freaky how fast they appear.
Certainly get it checked, they are usually harmless, take a couple months to go away, but from my experience the two we've had they didn't like them touched so they must be bothersome.
I did find that using an antibacterial sped healing.
That one is in a bad spot if it hurts... Any limping?
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thank you, could you recommend the antibacterial you used?