Why do I bruise so easily?

Margo🍷 β€’ πŸ’‹πŸ’‹πŸ’‹

I'm always getting bruises. Some small but some are massive. If I lightly run into something I get a bruise. Sometimes I get bruises and I have no idea where they came from. Yesterday someone grabbed my arm but it wasn't even that hard and it left a massive bruise. I also have some on my chest and shoulders..no idea where they came from

Does this happen to anyone else?