Cold/pain in finger nub after amputation of finger tip

I have a patient that had the distal part of her pinky finger amputated in order to treat a melanoma. She seamed to heal fine until 2.5 months after the surgery when the “stump” started to get cold and discolored. Her doctors don’t know why. The neurologist says its COMPLEX REGIONAL PAIN SYNDROME but the surgeon disagrees. Upon examination I found that her hand also goes cold. These cold sensations are intermittent and made worse by physical activity. At the same time her palms and forehead seem warm and clammy. She had poor sleep until her MDs have put her on Gabapenton (sp?), for nerve pain. The Rx doesn’t seem to help the finger but does make her sleep at night. Her tongue is pink with some reddness at the tip and a thin white coat and is a bit shiny.
Lastly she has also had some bouts (mostly at night) when her stump feels warm and “blistery”.

Any suggestions of points and treatment theory on this one would be greatly appreciated… Thanks

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