Sounds like it: could be a callous from his sucking the thumb. However, if it's painful and/or enlarging, I would recommend having his doctor check it, in case it needs treatment. It also could be a wart or a bump which has become infected.
Answered 1/16/2016
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A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
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