Dark skin, using YAG laser hair removal - what can I do to prevent hyperpigmentation?

I'm a male with dark skin getting YAG laser hair removal on my upper arms and shoulders. I'm also getting 1540 fractional laser done on my face for acne scars and texture. For my face, Obagi 50 SPF sunscreen + hydorquinine twice a day is a must. What do I need to do to protect my arms from hyperpigmentation or damage? I wear long sleeve shirts most of the time, but do I need sunblock or hydro?

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