I Keep Getting Unexplained Bruises On My Legs, They Don't

I keep getting unexplained bruises on my legs, they don't really hurt at all but are slightly lumped up. I went to my doctor who did quogulation studies and a full blood count which all came back normal.

I have been getting them since my little boy was around 6 month old, so for the last 4 months. It's beginning to get to me because it doesn't seem normal to me