What are the risk factors for developing hypopigmentation following pulsed dye laser treatment?

I just received my 6th PDL treatment for post-inflammatory erythema macules on my face and chest today. Spot size=5 mm, Fluence=7 J/cm2 and pulse duration=1.5 ms. Settings were increased after I experienced no adverse effects in my first 3-4 treatment sessions and my PIE has improved. I have South Asian skin, light brown right now (and not tanned). How likely is it that I will develop hypo or hyperpigmentation? Is it common for hypopigmentation to develop months after treatment has terminated?

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