What Do Red Lumps At The Tetanus Injection Site Indicate?
Consult a General Surgeon and get an Ultrasound
Thanks for your query, albeit short and specific.
Noted the history and understood your concerns.
It is normal to have mild tenderness and redness for a few days after a Tetanus shot.
Since the shot was given 7 days ago and you still have a firm lump and redness in the area I would advise you to have a clinical evaluation by a General Surgeon and high resolution ultrasonography to see if this is a lump or whether more changes like liquefaction are present to decide whether an active treatment is needed or not.
I hope this answer helps you.
Please feel free to give feedback and ask for relevant further queries if you feel that there is a gap of communication.