Re: bruise appeared on top of my hand
You dont say your age here so I am wondering how old you are. My mother had what the doctors call thin skin. I am 49 and developed it when I was around 40. I have bruises show up everywhere on my body and dont remember how they got there. You could pinch my mother on the arm and she would bruise. I havent got that bad yet.
Another thing could be that your blood is too thin. If it doesnt go away or you find another, you may want to get it checked out.