It could be a number of things. Can you get a picture and post it so we here can guess what it could be?
Could be ringworm, mites, mange, bug bites, rash, hives, etc. The bump between the toes could also be bites or even a cyst. Tough to say without a picture.
LISA ~ Lily LaRue - 4/07 boxer; Buster McDoogle - adptd 6/07 Vizsla/Besenji mix; Annabella Kanicki - 5/08-7/09 staffy; Mr. Smiley - 4/10 Boxer/pibble mix; Fozzy Bear - 5/10 Red Heeler/pibble mix