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With Lightroom red dots are formed on the white areas such as exposure correction or whatever.
The Red spots would be Clipping indicators. (Red=White. Blue=Black)
Press keyboard [J] to toggle on/off both the White and Black clipping indicators. In Lightroom-Classic (and old Perpetual versions) you can also click on the indicator triangles on the Histogram.
In Lightroom-Desktop v4.2 the keyboard [J] toggles Clipping indicators-