How Long for a Hematoma to Re-absorb? (photo)

Hi, 7 months ago I was involved on a car accident, hit my face against the passanger side.The doctor said an hematoma was formed.Went down from what it was the first 4mts, I went to a Plastic Surgeon 3 mts ago. My last visit was 2 months, she said it will go down by itself, an no longer need to see me, but my problem is still hurts and is not goin down anymore. I applied Arnica cream, I read online it helps but no luck.Will go down completely?Should I wait more time or look for another Doctor?