Will PIH Come Back on the Same Areas Post-Fraxel Treatment?

You have a susceptibility for PIH, so Fraxel might have been one trigger, but other factors, including sun exposure, may cause the pigmentation to be more evident in the future. It is recommended to use sunscreen, regardless of history of PIH, when exposed to the sun. You’ll decrease your risk of skin cancer and appear younger than your friends who don’t protect themselves.

Hi JGS,
Post Inflammatory Hyperpigmentation (PIH) will usually fade over time. It is important to wear a physical sun block, hats, and avoid over exposure to the sun. If you are like me, you like being outdoors, but need to remember to reapply your sun block frequently especially during the summer.
Good luck and be well.
Dr. P

Postinflammatory hyperpigmentation is not the same as melasma.  Once it clears using hydroquinone and sun protection, it should not recur.  You should however always use sun protection.