Pour tea into sitz bath and soak. Regular bath - make tea as directed. Add to bathwater and soak. I'm surprised you've never heard of this. Soaking wounds in salt water is the oldest medical treatment in history and still one of the most effective and most commonly used around the world.
Salt water promotes healing.
Salt water is actually soothing to open-tissues. Just thought I'd tell the theory behind it's use. I saw this used until about 1987 or so and saw some dramatic wounds get better. Don't know if it was the sugar or not. I wouldn't use this with diabetic persons because there glucose blood levels are already potentially high sugar levels.