Skin LOL. It's living tissue which happens to be plastered over your muscle fibres & skeleton. What's more interesting is how we OBSESS over it.
Throughout your entire lives, society has drilled into your minds either intentionally or subconsciously that bad skin = bad life. Spots = ugly. I just find it funny that if we lived in a world where everyone naturally had red marks on their face, and that was considered truly beautiful, then people would strive for it. Imagine a world where we as a species evolved and that red marks meant skin was healthy. Billboards had ads with pretty women with faces covered in red marks. Then if you didn't, you would feel like the outcast. You would look in the mirror and say, fml, when are my red marks going to come in. Girls would go to the bathroom and apply red makeup on there faces before heading to school.
Point I'm making is; we adapt to what we are exposed to. No, I'm not trolling.