I bought a horse (my first ever) from Canada two weeks ago. It had been on a trailer for 9 hours to get here. The left hind leg was swollen. My trainer put an ointment on it (small black cylindrical container, green lid, didn't see name), wrapped it and the swelling went down. Leg started swelling again the next day, but mimimal. Got better by riding him but didn't go away entirely. In the mean time he developed an infection in the bulbs so stall rest. Left hind leg swollen again. Ointment, wraps and voilà, swelling completely gone after two days. That was yesterday. I went back this morning and hell yes, swollen again. Both legs but left leg worse than right.
It does not bother him, he doesn't limp at all. It's the lower legs, starts mid cannon bone to around fetlocks.
Is this just due to inactivity or time to call the vet?