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These could mean a fungal or a bacterial infection as well, it could also be athlet's foot, but this mandates an examination .
For now, make sure you do not allow any moisture collection between your toes, use powder to keep it dry, avoid wearing socks and covered foot wear for a while, and do not scratch or meddle with them , as they can get infected more.
Visit the doctor soon , and get a sugar test for diabetes
Wish you good health