Is this the tyndall effect?

I encourage you to return to your injector for an evaluation. With excessive bruising it may be helpful to use Arnica or Bromelain supplements. Sometimes laser treatments are indicated. As four months should be ample time for it to heal you may wish to get a second opinion.

No, the Tyndall effect is the appearance of whiteish discoloration in the injection area. What you describe is simply a vessel that was poked by the needle, which causes a bruise. Everybody reacts to this differently and at this point all you can really do is cover it with makeup and wait till the bruise goes away.