When the comedo closes, skin cells grow over the top of the plug and stop this oxidation from happening, so the whitish color of the sebum shows through.
Then you've got this thin little whitish layer in the middle. Those are your warriors, the leukocytes or white blood cells, that defend your body from toxins and foreign microbes.
During the first half of August, if we look at the lower branches of the pine trees, we shall discover, here and there on the foliage, certain little whitish cylinders spotting the green.
And just as I was stooping and laying down the stakes, I saw something odd and round and whitish lying on the ground under a nut-bush by the side of me.