Lately my arms and hands are looking purple and feeling cold although I don't have cold. They also became really skinny I can nearly put fingers around my upper arm, it looks unpleasant because the rest of my body isn't that skinny. It seems that all the fat is sucked out of my arm... I do a lot of long distance running is it possible that this is the cause?
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I 100% agree with raptor's answer, it could be those and it is hard without seeing a doctor which one it is.
I however also agree with jmr2191, Raynaud's Phenomenon is a possibility, but Raynaud's is more common in males. But I reckon females can get it.
Honestly Hun, I know you don't want to, but Id see your doctor about this.
AS few ways to weed out possibilities is to test your circulatory system.
Read these articles on the way to do this. It can be different for everyone, but nature gave us multiple tools to help us.
Look into this. If you train and not fuel your body well, this might be the problem in it's self.