Bryan said:Severely overwashing your skin can definitely disrupt its normal condition and cause problems, but you need to understand that not ALL of the oil in skin is sebum! Not by a long shot! Problems that you get from doing the experiment you describe above come from the removal of fats and lipids of purely epidermal origin, disrupting the stratum corneum, etc. It has nothing to do with sebum per se.
That's interesting. What do you mean by sebum? I mean sebum as all the oil that your skin produces at the glands.
As far as I know sebum is the oil your skin produces, couldn't think that there's a difference between that. If you run out of oil in some parts of your body it'll eventually make your skin fragile.