Calm coat maybe? You can spray it on so you don’t have to actually touch and irritate the area. However if it is tender I would be highly suspicious of an underlying problem that is either chronic or has not healed yet.
I would be checking for tender spots around the spine/rump and pay very attention to how the horse moves/carries itself.
home to 6 overly spoiled, fat, shiny, adorable horses, and 4 cute barn kitties