Yes, you can get dragged on the internet for pretty much anything these days. Take Megan Fox, for example, who, just a few years ago, was the victim of online trolls because of—get this—her thumbs.

Fanconi anemia is a rare inherited condition that can affect the thumbs. Some people with the condition may be born with extra, missing, or misshapen thumbs. While Fanconi anemia does not affect the ...