Micranthes stellaris

Sounds like a Harry Potter spell!
More commonly known as the Starry Saxifrage or hairy kidney-wort.

I spotted a few clumps of this little flower on the ascent up the slopes of Ben Lui. Very delicate little arctic-alpine flower in this case with 5 white petals, each one with two greeny-yellow spots, and 10 red anthers, each flower less than a centimetre across.
A nice chance to take a breather at 1000m up the Southern ridge.