Septums are not as likely to get infected as most piercings as there is plenty of mucous membranes (yuck) to fight off infections in your nose.
Herein, can septum piercings cause congestion?
Septal hematoma.
A septal hematoma can develop if the piercing damages blood vessels and the tissue lining the cartilage, causing blood to collect between the two. This can cause pain, swelling, pressure, and congestion.
Also, what does an infected septum piercing look like?
Your piercing might be infected if: the area around it is swollen, painful, hot, very red or dark (depending on your skin colour) there’s blood or pus coming out of it – pus can be white, green or yellow. you feel hot or shivery or generally unwell.