Does anyone have any idea what this looks like?!

Jaime • Mommy to two beautiful baby boys and three angels and one more little bundle on the way ♥️💕♥️

Yesterday I left for work around 3 pm my son had no marks on him. When I returned home at 10 pm he was fast asleep, I checked on him and all seemed well. But this morning when I got him up his fingers looked like this! I am not sure what this is. He won't let me touch them, he keeps sucking on those 2 fingers. Does anyone have suggestions? I made a doctor appointment but they can't get him in until tomorrow.