Dead pixels that grow

I have had a couple of dead/stuck pixels on my device for a while now, the first day there were only about 6, so I ignored them and the next day there were 12 and seemed to have changed shape. It has been 4 days since they have first appeared, and there are about 50 to 70 in a big cluster, with several smaller clusters. and I am becoming relatively concerned . They appear to move when I apply pressure. I also have a crack on my screen, although I am unsure if this caused the issue as it had been cracked for several weeks before the pixels began appearing. I tried JScreenFix two hours ago, and I left it on until now, and some of the smaller clusters seem to have gotten smaller, from about 20 pixels per cluster to now 16 pixels. The clusters are also visible when the device is off. When on, the pixels appear grey, and when off, they appear black (Blacker than others, under light functional pixels look reddish brown, but the problematic pixels appear completely black). Are these damaged, dead, or stuck pixels? And is it repairable? Or should I just live woth it? Everything else is fully functional, the touch function still works on the area, the display function appears to be the only malfunctioning feature. The pixel counts are estimations, but the large cluster is about 2 mm wide and 2 mm high. The smaller clusters range from about 3 pixels wide and 2 pixels high to 3 pixels wide and one and a half mm high to 1 mm wide and 6 pixels high.