Inquiry about treatment of skin pigmentation in boil areas

I have some pigmentation left on some parts of my body due to the aftereffects of a boil I had a while ago.
This pigmentation is about the size of a coin, and it is noticeable and causes a lot of concern. It is difficult to completely cover up with makeup, so it is a situation that causes a lot of concern in daily life.

I would like to know if there are any treatments that can effectively improve or completely remove this post-inflammatory hyperpigmentation.

If there is an effective and safe treatment for relatively deep pigmentation caused by boils, I would appreciate some general information about the expected treatment duration and cost.

Once you start systematic treatment, is it really all cured?
thank you