As part of my DD I have a node and a slight contraction between the knuckle and first joint of my left index finger.
This morning I woke to find that the end of that finger was cold and numb, and had obviously had its blood supply blocked.
Ten minutes of massaging got the blood flowing again, and the only remaining problem five hours later is a slight tingling.
I don't know how long it had been without full blood supply, but it's rather worrying that it didn't hurt, and so a future episode could go on long enough to seriously damage the finger.
Thinking about it now, it's rather obvious that big, hard growths could compress a blood vessel, and yet I haven't seen this mentioned anywhere.
So my question to the forum is whether others have had similar experiences, and what should I know for next time, if massage doesn't quickly solve the problem ?

Thanks for the reply. I thought it was blocked blood supply because it felt cold (only one finger, only past the node), but after reading the link I'm now wondering if half asleep in the dark I misinterpreted numbness for cold, and maybe it was just a nerve that was being compressed by the node, not a blood vessel. I guess that would explain why there was no pain after massaging around the node and getting feeling back. (I should have turned on the light to see the colour.)
But there again, both sides of the finger were numb, which would seem to require that two nerves were compressed at the same time, which seems odd. It took 6 months to get to see a hand surgeon last time, and even a regular doctor takes a few weeks, so it's great to be able to get some advice from fellow sufferer here.