I think I am getting a corn, help

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I wore a pair of shoes that were too small. It appears that a corn is arising on my right small toe. It hurts too. I try to massage it. I also tried to saw it saw it away with a utensil I use for bottom of my sking for dead skin. I never had corns. I can see a small white circle and feel it trying to come. What can I do to prevent this? Or, is the damage done? Can I get something form a drug store to put on this? It is very uncomfortable. Thanks