It may be heart related. But when you say "red" turnin
g to "blue
" those are colors associated with Raynauds. Do his hands ever look a waxy white color, particularly the fin
ger tips? Just another thin
g to thin
k about. They can do a capillary test to see if he has Raynauds. Somehow they check the fingernail
s. I haven't had it done. My doctor took a look at my cold, gray feet and said I had Raynauds. You can google it for more in
formation, see if it fits.