In all likelihood, what your wife is suffering from is not a truely blocked or calloused sweat gland . . a condition which is referred to in dematology as "porokeratosis," but most likely a "seed corn" which podiatrist often mistakenly refer to as a porokeratosis.
A brief, but adequate discussion of the foot problem, complete with pictures for your viewing pleasure can be found at http://www.zfootdoc.com/seed.htm
See if that looks like what your wife complains of. Also, take note of the treatment choices . . none of them terribly good.
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