So what's in the picture? Eggs. Tetranychus urticae aka red spider mite or two-spotted mite EGGS.

One of the eggs is close to eclossion, that's the Eye-spot stage egg. Zoom in and you'll notice the little red spot...

You can also see a kind of threads, this indicates that the pest has been present for some time and the number of adult individuals that we are going to find is already out of control!