HI there my moms cat had a similiar looking item on his pads of his paws. It turned out to a problem called encephalitis granuloma. Some vets refer to this as rodent lip or salmon lip as this is also an area where it presents itself.
I would defiantely have a vet check it out though and give you some piece of mind.
Good Luck and please let us know how you make out... 
__________________
Tabitha April 10, 1995 - August 23, 2013
Bomber April 10, 1995 - July 12, 2010
Winston Nov 15, 1999 - September 15, 2011
Sophie Aug 30, 2011
"UNTIL ONE HAS LOVED AN ANIMAL, PART OF THEIR SOUL REMAINS UNAWAKENED"
He is your friend, your partner, your defender, your dog. You are his life, his love, his leader. He will be yours, faithful and true, to the last beat of his heart. You owe it to him to be worthy of such devotion.
-Unknown
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