The pimple I squeezed earlier this year is still dull.

I have a pimple that I couldn't resist squeezing at home. It was quite deep, so I squeezed it more like a pinch. Once I thought I had extracted all the concentrated fluid inside, I immediately applied Fucidin, and after a few days, I consistently applied a regenerating ointment as well. It has improved a lot compared to before, but that area still looks dull, so I'm worried. As far as I remember, I squeezed it early this year. It really takes a long time to heal. Is there any trick to this besides going to a dermatologist?