Post inflammatory hypopigmentation is a very common side effect of laser treatment. Creams like Elidel cream or Protropic can be used on these hypopigmented areas but you should use it only after a dermatologist’s prescription. If the symptoms still persist then you can talk to your dermatologist about laser-assisted chemabrasion(LACA).
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.