Lots of choices.: It could be anything from having a piece of whatever he stepped on in there, to a wart, to a 'tattoo' of dark pigment under the skin. Please have his doctor take a look and see if anything needs to be done for it.
Answered 11/18/2016
6.1k views
Anything: Best to have it checked out. It could be a splinter or a foreign body (this usually hurts though) or a hyperpigmentation.Had a patient with same scenario, his was just dirt.
Answered 8/2/2015
6k views
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