two year old with brown spot on bottom of foot

My son is two years old he has a brown spot on his left foot on the bottom, it just appeared out of no where, what could this be?

Posted By Danielle on October 03, 2006 at 11:13:58:
This soft padded night splint with contoured posterior shell provides passive dorsi flexion to address plantar fasciitis and achilles tendonitis. Shipped with toe wedge for additional stretch on plantar facia.

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