Most PIE is deeper "dermal" vascular issues. ITs wounding post acne. AKA reds.

1064nm can work for this, it needs several treatments, it also works on browns and pigmentation issues.

You need Hydroquinone and retain a or tretinorin if your doing treatments and prone to pigment, ie. Asian, Black, Middle Eastern, Indian, etc... These skin types must treat for several weeks pre procedure to avoid discoloration, and after healing.