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Like a corn, a callus is an area of greatly thickened skin that develops in a region of recurrent pressure. LTnlike a corn, however, a callus involves skin that is normally thick, such as the sole, and is usually painless. If a callus is painful, suspect an underlying plantar wart.
A plantar wart is a common wart (verruca vulgaris) located in the thickened skin of the sole. It may look somewhat like a callus or even be covered by one. Look for the characteristic small dark spots that give a stippled appearance to a wart. Normal skin lines stop at the wart's edge.
When pain sensation is diminished or absent (as in diabetic neuropathy, for example), neuropathic ulcers may develop at pressure points on the feet. Although often deep, infected, and indolent, they are painless. Callus formation about the ulcer is diagnostically helpful. Like the ulcer itself, it results from chronic pressure.
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