Hyper-pigmention on cheeks and nose due to microdermabrasion 5 years ago. Is there any permanent treatment for this? (photos)

A series of Intense Pulsed Light treatments (IPL) in combination with a proper hydroquinone protocol should fade the pigmentation. Abruptly stopping hydroquinone can cause adverse side effects on the skin. You must gradually reduce your dose while simultaneously starting a non-hydroquinone skin brightening program. Also, correct use of sunblock will prevent pigmentation from returning. It is unlikely that microdermabrasion itself would cause this issue, unless the practitioner was overly agressive and/or you had direct over-exposure to the sun shortly after having the treatment performed. Good luck!