Hi, i have dry gangrene in my middle finger from lack of blood flow, i have raynaurds aand scleraderma, and sjogens, this started on December 18, my doctor started me on Amlodephine and Pentoxiphline. my concern is I m on computer at work and have pains in my hand I guess from typing, I thought it would have fallen off by now, how long does it typically take for it to fall off and heal?Do I have to wait until the nail grows totally out, it has the black area and white crusty area around it, it itches,so I guess it is healing right, I wear a glove most the time, because it does get cold and looks bad.