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Melano melanoma. patients may worry about what's raised. we look for symmetry, color changes, diameter, evolving spots. those are criteria we look for. we have special lights we can look at. we have devices that can help us. we have experience. >> doctor, would you go as far as saying these apps giving the impression 20 people out there could figure out moles on their own. would you call them dangerous? >> they give you false sense of security that one spot is okay, may or may not be okay many and of itself. you may not go see the doctor for other spots that are harmful and delay diagnoses. th...

There's bleeding there's hemorrhage. it takes on a course of recovery. the color changes, for example. it would have still been observable especially in an autopsy. they look for that sort of thing. >> so it's not possible he had any other bumps or bruises? >> i don't think so. i think the outstanding information is the trauma to the head the fractures of the vertebrae, the three vertebrae, and the severance of the spinal cord. >> now in the cell phone video of the arrest a woman screams that there's something wrong with freddie gray's leg, that it looks like it's broken and he's dragged into ...

Mochy white. when frostbite is more severe it can be painless. any color changes or severe pain those are certainly warning signs. >> hypothermia? >> hypothermia can result in many different ways. it can present with confusion, altered thinking. we know alcohol can increase your risk of hypothermia. so we would like to efmphasize that if you are taking alcohol you are outside be vig geilant t have. that's a risk factor. >> a lot of people suffer from this. you feel a little sad and down in the winter time. it is actually scientific there's a reason behind it. >> that's right. we are talking ab...