7 month old with bruises?

So yesterday my mom noticed some bruises on my 7 month olds legs. Right on her shins on both legs. They look like hand prints but are way too small for anyone who cares for her, like the size of a toddlers hands. The only people who watch her are me (70%) my mom (15%) and her dad/my boyfriend(15%). She is very mobile when it comes to crawling and she is pulling herself up to stand constantly. I’m just not sure if it’s normal for a baby to get bruises, my mom even said it wasn’t. I couldn’t imagine handling her hard enough to cause bruises. Plus she falls and I don’t see bruises anywhere else, like on her butt or head or back. Anyone else deal with this?