Scalp Micropigmentation (SMP) is a tattoo and like all tattoos they tend to fade over time. We have been doing it for 5 years and although we offer touch-ups for fading, few have come for that service and seem to be happy with what we have done. As far as blurring, if it is done right, then it should not blur from one dot to another. See website below.
SMP is like any tattoo. It will fade and blur over time. Over time some may want a touch up (like any tattoo) Most Scalp MicroPigmentation at our practice we have not needed a touch up. I see about 10 to 20 percent of our patients return for a touch up after 2 to 3 years (not because they "need it", but because they "want" to look their best). SMP quality and even technique differ from clinic to clinic so there is no absolute time frame.