How can I get rid of pigmentation caused by mosquito allergies?

I have a constitution where I get bitten by mosquitoes really easily.
When I get bitten, it's not just itchy; the reaction is really severe.

It’s not just a small red spot; the skin swells and hardens as if burned, and the red spots tend to spread out very large.

It was like this when it was severe.

 

It became discolored like this later.

Still, this disappeared after half a year.

The pigmentation on other skin types lasts a really long time.

The swelling and itching go away over time, but the bite site leaves severe brown discoloration.

 

I got bitten last summer, and the bite is still there.

They say insect bites usually disappear quickly.
Once I get discolored, it lasts for at least a few months, and in severe cases, it can even go on for over a year.

It does fade over time, but it doesn't feel like it disappears completely. When summer comes and I get bitten again, the same thing happens on top of the existing problem, so it's back to square one.

 

What do people with allergy-induced skin pigmentation usually do?

Of course, I applied moisturizing cream and sunscreen, and I even tried whitening cream, but I didn't really notice a dramatic effect on this kind of discoloration that isn't a breakout.

Can this also improve with laser or pigmentation treatment at a dermatology clinic?

 

My skin naturally discolors easily, and I also have some keratosis pilaris, so it looks even more prominent.

Actually, when I get bitten by a mosquito, if I leave it alone, it gets really itchy and swollen, so I apply a very small amount of steroid ointment prescribed by a dermatologist. That is the only way to calm down the redness and swelling... Could this possibly affect the discoloration?

I am really worried about how to take care of this kind of skin.