Azelaic is a great non HQ system.
I recommend that you apply the appropriate creams to the entire face.
Cysteamine is a strong agent and may cause hypopigmentation especially in daark skin.
Melasma treatments are lifelong and should be tailored for each patient.
Melarase is a great regimen to add or a Brightening Kit in its entirety.
I also recommend that you add one of two of these oral supplements for pigmentary control: Scler-X PIH Relief Complex from VenaSmart or Pigmentation Correction Complex from KareSkin.
You will need wide spectrum UV protection with SPF 30+ sunblock as well.
H Karamanoukian MD FACS