Is it normal to bruise very easily?

Anonymous
I find my self with random bruises when I haven't done anything traumatic to cause them. I also find I get them if my boyfriend just grabs me a little harder than usual. Although I don't get hickies very easily. At the moment I've developed a red sore mark on the back of my knee which will probably be a bruise tomorrow and I have no idea what I did.

Would me being iron deficient cause it? I have supplements but I forget to take them so take 3 when I remember (they recommend 1-3 a day)
Is it normal to bruise very easily?
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