A small bump

Hi guys, my LO is 1month++ old already. I just noticed this at his left arm. Is this a post injection scar from the hospital when he was a newborn. I’m quite worried and thinking if I should visit the PD.

A small bump
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If it’s the BCG site, then it’s normal. My baby still has it at 4 months and recently it has pus and it came gushing out. The polyclinic nurses said it’s normal. You can go have it checked out if you are worried. Better to be safe.