OK, my friend Adam told me, upon closer inspection, that he doesn’t believe that this is cause for any concern. I believe him because he is an expert:
In his expert opinion, my bald spot is not a case of male pattern baldness but evidence of previous head trauma. This makes a lot of sense. Apparently I am blocking the incident from my childhood, but my parents tell me that one of my younger sisters once hit me on the head with a blunt object—a steel baton, I believe.
While I am not specifically concerned about baldness in general, I am somewhat relieved.
Now, however, I believe I have to research childhood head injuries and whether they have been linked to mental health issues in adulthood. It might explain some other things that concern me. I’ll keep you posted.