That swelling as you said is a part of gum tissue near the erupting wisdom tooth is called as the opercular flap .
In some cases it may be required to be removed if it's causing trouble like pain , irritation, food lodgement. .....etc.
In your case ,currently don't have any trouble with it.
But,
In the future may require treatment if have any trouble with it.
Next Steps
visit dentist in case of any kind of trouble with the wisdom tooth.
Health Tips
gargle with lukewarm salt water after every meals to maintain oral hygiene