Hard bumps on top of feet only no pain

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For about 2 years now (never before that) i have had small hard brown bumps on the top of my feet and sides not on the bottomo or between toes - they don't itch at all, and they don't hurt at unless i pick at them - some are bigger and some are smaller. I have been to a dermt. and they perscribed Triamcinolone cream which has not worked - what could this be- again no pain, never itchy...