Could be anemia or dehydration, but if you've had those checked, it could just be your system resources concentrating on healing. You don't have a fever do you?
Hormones tend to run amok with healing, inflammation, etc. I've had that problem for years, maybe decades, but my labs are always good. My rheumatologist just chalked it up to secondary idiopathic Raynaud's, which is pretty common.
Jan 