If you are worried about it, have the vet image it and/or ultrasound. My mare kicked a very stout pipe fence last December. She wasn’t lame but literally had a goose egg on the outside of her left hind. She wasn’t lame and it slowly started to resolve when…she kicked the fence again. This time, she was slightly off for a couple days but then fine. This spring I turned her out and she lost her mind over the BO’s foal turned out next to her and she ran up and down the hill several times slamming to a halt at the fence line. Yep…minorly lame again. I loaded her up and took her to the vet for X-rays as I was concerned about the splint bone. No fractures and on palpation, he didn’t feel that there was any suspensory or DDFT involvement so we decided not to ultrasound at that point. She has been sound but I think that ‘goose egg’ is with her for life. It has resolved some and the generalized swelling in that leg is gone. The imaging gave me piece of mind to know there was nothing more ominous going on.
Susan