Necrosis or Bruise? (photo)

     Bruise would be more likely given the appearance in the photo with the lack of symptoms.  As always, the injector should be kept informed of any concerns. Kenneth Hughes, MD Los Angeles, CA

It looks as though you've bruised, which is common. If any additional symptoms arise or if the area doesn't improve, follow up is recommended. Best of luck!

Definitely looks like a bruise.  It is very common to show up more the next day.  If the color and sensation is normal in the surrounding area I would say you don't have anything to worry about.  Follow up with your provider if you are still concerned.