Is there any difference between the PicoSure Focus and the PiQo4 and which is better for sun spots and melasma?

there is a HUGE difference between a focused pico and a switched pico, you need to see an expert, both do different things and have downtime versus not.  you also need to pretreat your skin especially if you are doing this for pigmentation -- cosmelan or enlighten peel (which we can send to you and do virtually with you see emeragecosmetics.com where we do free skincare consults daily), add vivatia foam, phyto +, is clinical pro heal, and faith essance serum to help pigmentation.  Best, Dr. Emer.