MAT,

I'm pretty sure you have mentioned having the Livedo reticularis, as I do. Even if this is mild (which I think you said), it is still an indication of a vasospastic process in your blood vessels (Livedo is an autonomic dysfunction caused by spasms of the medium sized blood vessels in the skin). Since you have this already, it is a good indication that your other skin & digit changes are very possibly vascular/circulatory in nature as well...as in secondary Raynaud's or other damage to the blood vessels.