Foreign body: If the callosity is coming to a head, you have a foreign body that is being extruded. If the "callus" id painful and on the sole, it would be a plantar wart. This needs careful removal of all the thick dead skin until you can see tipping dot in the middle. While the core is exposed let a dermatologist freeze it with liquid N2. Not concerned about the pigmentation. Brown is beautiful!!
Answered 3/18/2016
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