3 weeks post op canine implant I can see the metal part exposed. Premolar adjacent to it has slight mobility as well. (photo)

The picture is a little bit unclear, but it looks very possible that what you're seeing is either a healing collar or a cover screw.If it is a cover screw, then it may be a little tricky to restore this implant esthetically but it won't be impossible.If it is a healing collar, then this is perfectly normal and nothing to be concerned about.This is a question that your implant dentist can easily answer so that your mind can be put at ease.I hope you found this information to be helpful,Dr. Champagne

From the very blurry picture, it looks like a cover screw or healing abutment.  If it is a cover screw, which is very shallow, then you have a problem.  If it is a healing abutment which is much longer, then it will be fine.  It all depends on depth of the implant.  Hope this helps.

that exposed part is implant cover screw. no need to worry about that, it will stay there during healing phase[3months] only.