If your gear is clean and you follow good injection protocols/procedure then this shouldn’t happen.
It’s seriously dangerous as the staph infection can form deep in the injection site then you don’t even notice it until it’s an abscess. With that said you can get any type of a bacterial infection from pinning, strep based or worst of all MRSA based too so stay clean.
I would double check your sanitation procedures prior to your next pin, or if you know your good then be cautious of the gear.