In the right foot "black toes" google ingrown toenails and athlete's foot was also mentioned with the gangrene. On the latter doc. said the blue (she said, looks black to me) always starts with the tips of the toes. That the little tidbit to know on gangrene. Leaving that, it's interesting i have bad ingrown toenails (big toes badly) on both feet. And on the right foot at about 13 the worst case of athlete's foot dad, who had seen a few, had ever seen. Nothing worked on it until the blisters were cut with tiny nail scissors to release the liquid in them then iodine was poured on them. It hurt like hell but, after repeated cutting and iodining, in about four-five days the foot was dry and healing. So if you ever hear of anyone with athlete's foot which the lotions and powders available don't fix that's the cure. Better still forget the other and, if blisters exist, go straight to the tiny sharp nail scissors to get right to the edge of the blisters and the iodine fix. It's the best. Will let you know on the foot but i know it will be all good. The body talks and i listen to it. ;-) 3:30am.