In the last year, I have noticed that I get blood blisters on my forearms. I can get them when carrying my purse over my arm, when my dog jumps in my lap and sometimes, for no apparent reason at all. After they heal, a brown spot is left behind and sometime that spot will refill with blood on occasion. Recently, one actually broke open and wouldn t stop bleeding until I applied pressure, then a bandage. Should I be concerned?