Poor blood circulation?

    I%26#039 and blood this poor to usually circulation
    
Poor blood circulation?
I%26#039;m a 13 yr old girl. I%26#039;m thin and tall. My hands and feet are usually red, purple, or blue. I am also usually very cold. I think this is a sign of poor blood circulation. I%26#039;m just curious, if I went to the doctor%26#039;s and I ended up having poor blood circulation what would they do about it?