we tried lots of things with my horse, none which helped!!! and then best thing to do (i would say....) is if they are forming and tender then rest, if they have formed i would just leave it and wait for nature to take its course, they can be re absorbed!! my horse has two large ones and they are now shrinking rapidly!! sorry i cant give u a cure but some of the ointments they do just really irritate the skin!
i use magnet boots on them! seem to be going down - but maybe they would anyway! after they formed i did lots of cold hoosing. then was careful about using tendon boots so would use bandages instead.