Bruise or birthmark at 2.5 weeks?

I just noticed this mark on my son's forearm this morning- it definitely wasn't there yesterday. I'm wondering if it could be a birthmark or if it is a bruise? I don't know what he could have hurt himself on and he doesn't react in pain when I touch it so I'm leaning towards birthmark. Not sure if birthmarks typically don't show up for 2.5 weeks though?
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