When I was 11, in what y'all know as "7th grade" but Mexicans call, "Primero de Secu", I accidentally stabbed my right thumb with an Inking Nib Pen when I put my hand in my backpack trying to reach for something.
I remember it broke and the tip of it got stuck inside of my flesh, which is why I have that small black dot in my right thumb.
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A few weeks ago I noticed that I have another black dot in my left thumb? But this time I didn't stabbed myself with anything?

(PS: Not self harming!)