Is Hyperpigmentation Due to Alexandrite Laser Permanent?

Usually not.  I most cases, it is a temporary problem known as post-inflammatory yperpigmentation.  Best treatment is a broad spectrum sunscreen with a high SPF that blocks both UVA and UVB.  Using a bleaching cream with 4% hydroquinone is often helpful as well.  In some cases it could take a year or longer, but eventually the hyperpigmentation usually fades.

Potential risks of laser hair removal include temporary or permanent hypo-pigmentation or hyper-pigmentation. This can occur even when optimal laser treatment parameters are used. Fortunately most instances of hyperpigmentation are temporary and tend to fade over time. We instruct all our patients to make sure the area has had no sun exposure for one month prior and one month after the laser procedure. Daily use of an effective sunscreen is key, regardless as to whether you are going outdoors. Also, make sure you are not taking any photosensitizing medications or over-the-counter supplements known to cause photosensitivity. You should consider applying prescription-strength 4% hydroquinone cream to the areas of hyperpigmentation to help them fade more quickly.