Prolonged redness/erythema and Post-inflammatory Hyperpigmentation (PIH) will require different types of Lasers to precisely treat these conditions.
PIH will require Picosecond Nd:YAG/Alexandrite lasers or Q-switched Nd:YAG lasers. Picosecond Lasers are proven to be more effective for stubborn PIH that cannot be removed with Q-switched lasers.
Prolonged erythema can be removed with Pulse Dye Lasers or Copper bromide lasers.
The first step to finding a doctor who is proficient in treating the above conditions is to find a clinic that offers the above Lasers.
Next, ask the doctor for before/after photos of the cases that he has treated using these lasers.
Lastly, look for a doctor who can give you a comprehensive treatment plan as these laser treatments usually require several sessions with good post-laser aftercare to ensure optimal results.
Hope that this helps!
Best regards,
Dr Justin Boey