These bruises are weird, right?

Should I be concerned? I noticed these in the week (and tried to post a photo but Glow was glitchy). I have no clue what could have caused this bruising. I asked my husband what he thought and he said they look like someone grabbed my arm hard but like, who? I also know random bruising is also problematic but I am iron deficient so it's not unusual for me to have bruises pop but... But nothing like this before though. They don't hurt though. I noticed them because I actually thought I was dirty.