Hyperpigmentation, PIH and melasma are very common issues today. Depending on how deep the pigmentation lies in the skin can make this an easy or very difficult process. Most will use a daily melanin inhibitor [Fade Bright with alpha arbutin or hydroqinone] with SPF 50 every day to help minimize the spotting and help prevent new. Things like Vitamin C can also be exceptionally helpful. Retinoids should also be used at night. We recommend the Fusion A .15 (new users) or .25% (advanced users) to start off with.
Most likely peels will be initiated into the treatment. And depending on if you want little to no flaking [Lactic 50] a bit of dryness and some small flakes [mandelic 40] or if you are OK getting a lot of shedding with stronger peels such as TCA 13 and Jessners, you will be looking at a series of peels (6-8 in a row) to help minimize the darkness on the skin.
The key is NOT to get discouraged. This will most likely require quite a bit of treatment time to get a result you are happy with. SPF is very very important as is wearing a wide brim hat to protect the skin.
If you find that after a few months photos are not showing a great enough difference, you may need to look into adding on IPL or other laser treatments.