If someone didn't answer... I found arnica gel in the natural foods/ homeopathic area of one of the local grocery stores. It didn't do anything for pain on a fairly large bruise I got mountain biking but gentle massage with arnica 2-3x daily does seem to have sped up the healing. I also was able to ice it immediately, then you alternate heat. Supposedly gentle massage can encourage the lymphatic system to start dispersing the blood.I have been doing that because what can it hurt?

DH rode with a pretty nasty hematoma, the doctors were concerned about his because he takes a medicine that weakens his immune system. I seem to think he was on antibiotics as a mostly precautionary measure. Took a couple months to go away for him.