Is This Synechium Scar Tissue After Revision? Does It Cause Swelling? (photo)

This band of scar tissue is indeed a Synichia and it can occur after any rhinoplasty or revision rhinoplasty surgery. If it is causing you to have nasal obstruction (decreased breathing from your nose), it can be treated. If it is not causing any symptoms, it is advisable to not treat it, since all surgical treatments have risks associated with them, and you must decide if the benefits outweigh the risks. I hope this was helpful to you.

Your picture appears to show scar tissue in the nasal vestibule, probably extending into the internal nasal valve.  This is one of the most difficult complication to correct after Rhinoplasty.  However, release of the scar tissue followed by application of mitomycin might be helpful.

This type of scar tissues can and do cause obstructive symptom and can be corrected with incision  ( laser vaporization is best ) and silicone sheet splint between cut areas for several days.

It is a web which is scar tissue. Unless it is causing you breathing problems it requires no treatment.

The"fleshy nostril-blocking thing" IS scar tissue bridging across the apex of the nose, in this case, near the nasal valve, a very important part of the nasal airway. These are quite challenging to get rid off and are best avoided.

This is a band of scar tissue called a "synechia" which can be reduced or eliminated surgically. It probably does obstruct nasal air flow.

  This appears to be a web along the top portion of the incision used in a Closed Rhinoplasty.  Rhinoplasty Surgeons sometimes don't close that section of the incision but I always do in order to prevent just such an occurrence.