Pimples in One area only?

I rarely get pimples.
I actually cant remember the last time I got one on my cheek, etc.

I sometimes get pimples on my head (under my hair) if I didnt wash my
hair in a few days. Buts thats like 1 or 2 a month.

BUT, right above the left side of my upper lip, I sometimes get
pimples.
Thats the only place I get pimples (that I remember) on my face.

I get it there once in awhile, and its always around the same square
inch area.

Why would this be the case? Why only that 1 area?

Could something be wrong with the pores there?
I dont take care of my skin currently, what can I do to fix this? (if
there is something wrong with the pore)

Thank you