
Found it, quite a few people in Goldens have had great success by bathing the ear in liquid witch hazel. One poster said she stored the witch hazel in the fridge for best effect. Also quite a few people have had good success using the homeopathic remedy Hamamelis 6. The use of Arnica gel is also mentioned.
One poster stated that her vet (who is also homeopathic) advised that they were no longer draining them as they could refill and said that current thought was they were best left alone to disperse, simply advising a daily dose of Arnica. She was dubious at first, but after a few weeks the vet was proved right and the heamatoma did disperse.
Everyone seemed to stress that these methods are not an instant cure, but gradually work over a period of time. No one seemed in favour of surgery.
Hope this helps even if it just points you in the direction of further research.